diff --git a/apps/web/app/tasks/tasks-list-view.tsx b/apps/web/app/tasks/tasks-list-view.tsx
index 467254e594..6517fdb3ec 100644
--- a/apps/web/app/tasks/tasks-list-view.tsx
+++ b/apps/web/app/tasks/tasks-list-view.tsx
@@ -143,12 +143,16 @@ function TaskRows({
   onDelete: (taskId: string, opts?: { cascade?: boolean }) => Promise<void>;
   onRowClick: (task: Task) => void;
 }) {
-  const { t } = useTranslation();
+  const { t, i18n } = useTranslation();
   const workflowMap = useMemo(() => new Map(workflows.map((w) => [w.id, w.name])), [workflows]);
   const repoMap = useMemo(() => new Map(repositories.map((r) => [r.id, r.name])), [repositories]);
+  // `groupForTask` resolves its headings from the catalog (the no-workflow /
+  // no-repository fallbacks, and now the task-state vocabulary). Without the
+  // language in the deps a section header keeps the previous locale until the
+  // task list itself changes.
   const sections = useMemo(
     () => buildTaskSections(tasks, { groupBy: tasksListGroup, workflowMap, repoMap }),
-    [repoMap, tasks, tasksListGroup, workflowMap],
+    [repoMap, tasks, tasksListGroup, workflowMap, i18n.language],
   );
 
   if (isLoading) {
diff --git a/apps/web/components/task/task-switcher-color-menu.tsx b/apps/web/components/task/task-switcher-color-menu.tsx
index 4eea2431ea..2875985a2e 100644
--- a/apps/web/components/task/task-switcher-color-menu.tsx
+++ b/apps/web/components/task/task-switcher-color-menu.tsx
@@ -12,7 +12,7 @@ import { useSetTaskColor, useTaskColor } from "@/hooks/use-task-color";
 import {
   TASK_COLORS,
   TASK_COLOR_BAR_CLASS,
-  TASK_COLOR_LABEL,
+  TASK_COLOR_LABEL_KEYS,
   type TaskColor,
 } from "@/lib/task-colors";
 import { cn } from "@/lib/utils";
@@ -64,10 +64,11 @@ function TaskColorMenuItem({
   selected: boolean;
   onSelect: () => void;
 }) {
+  const { t } = useTranslation();
   return (
     <ContextMenuItem onSelect={onSelect}>
       <span className={cn("mr-2 inline-block h-2 w-2 rounded-full", TASK_COLOR_BAR_CLASS[color])} />
-      {TASK_COLOR_LABEL[color]}
+      {t(TASK_COLOR_LABEL_KEYS[color])}
       {selected && <IconCheck className="ml-auto h-3.5 w-3.5" />}
     </ContextMenuItem>
   );
diff --git a/apps/web/e2e/tests/task/sidebar-layout.spec.ts b/apps/web/e2e/tests/task/sidebar-layout.spec.ts
index ec3b4d4d9e..7dbaf06e13 100644
--- a/apps/web/e2e/tests/task/sidebar-layout.spec.ts
+++ b/apps/web/e2e/tests/task/sidebar-layout.spec.ts
@@ -128,9 +128,12 @@ test.describe("Sidebar layout — repo groups", () => {
     const session = new SessionPage(testPage);
     await session.waitForLoad();
 
-    // In a single-repo workspace, no "Unassigned" group should appear
+    // In a single-repo workspace, no "Unassigned" group should appear.
+    // Keyed on `data-group-key`, the identity, not `data-group-label` — the
+    // label is catalog-backed now, so a label selector would silently stop
+    // matching under any non-English locale.
     const unassignedGroup = session.sidebar.locator(
-      "[data-testid='sidebar-group-header'][data-group-label='Unassigned']",
+      "[data-testid='sidebar-group-header'][data-group-key='__unassigned__']",
     );
     await expect(unassignedGroup).not.toBeVisible({ timeout: 5_000 });
 
diff --git a/apps/web/e2e/tests/task/workspace-switch-sidebar-isolation.spec.ts b/apps/web/e2e/tests/task/workspace-switch-sidebar-isolation.spec.ts
index 8e51c5237b..40d481813f 100644
--- a/apps/web/e2e/tests/task/workspace-switch-sidebar-isolation.spec.ts
+++ b/apps/web/e2e/tests/task/workspace-switch-sidebar-isolation.spec.ts
@@ -116,7 +116,14 @@ test.describe("Sidebar — cross-workspace isolation", () => {
       timeout: 10_000,
     });
     await expect(session.sidebar.getByText("Workspace A Task", { exact: true })).toHaveCount(0);
-    await expect(session.sidebar.getByTestId("sidebar-repo-group-Unassigned")).toHaveCount(0);
+    // `sidebar-repo-group-Unassigned` was never a real testid, so this assertion
+    // was passing on nothing. The group header carries `data-group-key`, the
+    // untranslated identity — the label beside it is catalog-backed.
+    await expect(
+      session.sidebar.locator(
+        "[data-testid='sidebar-group-header'][data-group-key='__unassigned__']",
+      ),
+    ).toHaveCount(0);
 
     await gotoTaskList(testPage);
     await expect(taskInList(testPage, "Workspace B Task")).toBeVisible({ timeout: 10_000 });
diff --git a/apps/web/eslint.i18n.options.mjs b/apps/web/eslint.i18n.options.mjs
index a001d02d64..0baaed0eea 100644
--- a/apps/web/eslint.i18n.options.mjs
+++ b/apps/web/eslint.i18n.options.mjs
@@ -1345,8 +1345,12 @@ export const i18nGuardFiles = [
   // does resolve at call time. Only a locale-switch test covers it, which is
   // what `use-filter-value-options-locale.test.tsx` is for.
   //
-  // Still English in `lib/sidebar/apply-view.ts` and belonging to whoever
-  // migrates `lib/sidebar`: `UNASSIGNED_LABEL` and `MULTI_REPO_LABEL`.
+  // `UNASSIGNED_LABEL` and `MULTI_REPO_LABEL` in `lib/sidebar/apply-view.ts`
+  // were the English remainder noted here; they are now
+  // `sidebar:groupUnassigned` / `sidebar:groupMultiRepo`, resolved at call time
+  // alongside the `__all__` heading. `lib/sidebar` is still NOT on this list —
+  // the rest of the directory was not swept, so whoever migrates it adds the
+  // entry.
   //
   // One deliberate English change, the only one in this PR: the SSH
   // running-sessions confirm read "This executor has 3 running session(s)."
diff --git a/apps/web/lib/notifications/events.ts b/apps/web/lib/notifications/events.ts
index 26d3cb241b..50896923a0 100644
--- a/apps/web/lib/notifications/events.ts
+++ b/apps/web/lib/notifications/events.ts
@@ -4,22 +4,3 @@ export const NOTIFICATION_EVENT_SYSTEM_UPDATE_AVAILABLE = "system.update_availab
 export const NOTIFICATION_EVENT_OFFICE_INBOX_ITEM = "office.inbox_item";
 
 export const DEFAULT_NOTIFICATION_EVENTS = [NOTIFICATION_EVENT_SESSION_CLARIFICATION_REQUESTED];
-
-export const EVENT_LABELS: Record<string, { title: string; description: string }> = {
-  [NOTIFICATION_EVENT_SESSION_TURN_FINISHED]: {
-    title: "Agent turn finished",
-    description: "Notify after each completed agent turn.",
-  },
-  [NOTIFICATION_EVENT_SESSION_CLARIFICATION_REQUESTED]: {
-    title: "Agent needs an answer",
-    description: "Notify when the agent explicitly asks you a question.",
-  },
-  [NOTIFICATION_EVENT_SYSTEM_UPDATE_AVAILABLE]: {
-    title: "Kandev update available",
-    description: "Notify when a newer Kandev release is available.",
-  },
-  [NOTIFICATION_EVENT_OFFICE_INBOX_ITEM]: {
-    title: "Office inbox item",
-    description: "Notify when a new inbox item needs your attention.",
-  },
-};
diff --git a/apps/web/lib/sidebar/apply-view-labels.test.ts b/apps/web/lib/sidebar/apply-view-labels.test.ts
new file mode 100644
index 0000000000..4ddfed1bbb
--- /dev/null
+++ b/apps/web/lib/sidebar/apply-view-labels.test.ts
@@ -0,0 +1,89 @@
+import { afterEach, describe, it, expect } from "vitest";
+import type { TaskSwitcherItem } from "@/components/task/task-switcher";
+import { applyGroup } from "./apply-view";
+import { i18n } from "@/lib/i18n";
+import type { TaskState } from "@/lib/types/http";
+
+function task(overrides: Partial<TaskSwitcherItem>): TaskSwitcherItem {
+  return { id: overrides.id ?? "t", title: overrides.title ?? "Task", ...overrides };
+}
+
+const ALPHA = "/repos/alpha";
+const BETA = "/repos/beta";
+
+/** Two repos keep the `__unassigned__` bucket; one repo merges it away. */
+const REPO_TASKS = [
+  task({ id: "a", repositoryPath: ALPHA }),
+  task({ id: "b", repositoryPath: BETA }),
+  task({ id: "c" }),
+  task({ id: "d", repositories: [ALPHA, BETA] }),
+];
+
+function labelFor(groups: { key: string; label: string }[], key: string): string | undefined {
+  return groups.find((g) => g.key === key)?.label;
+}
+
+afterEach(async () => {
+  await i18n.changeLanguage("en");
+});
+
+describe("applyGroup — group labels are catalog-backed", () => {
+  it("labels the repository sentinel buckets in English", () => {
+    const { groups } = applyGroup(REPO_TASKS, "repository");
+    expect(labelFor(groups, "__multi__")).toBe("Multi-repo");
+    expect(labelFor(groups, "__unassigned__")).toBe("Unassigned");
+  });
+
+  it("labels the ungrouped bucket", () => {
+    const { groups } = applyGroup([task({ id: "a" })], "none");
+    expect(groups).toHaveLength(1);
+    expect(groups[0].key).toBe("__all__");
+    expect(groups[0].label).toBe("All");
+  });
+
+  it.each(["workflow", "workflowStep", "executorType"] as const)(
+    "labels the %s bucket for a task with no value",
+    (groupKey) => {
+      const { groups } = applyGroup([task({ id: "a" })], groupKey);
+      expect(labelFor(groups, "__unassigned__")).toBe("Unassigned");
+    },
+  );
+
+  it("uses the task-state vocabulary for state group headings", () => {
+    const { groups } = applyGroup(
+      [task({ id: "a", state: "IN_PROGRESS" }), task({ id: "b" })],
+      "state",
+    );
+    expect(labelFor(groups, "IN_PROGRESS")).toBe("In progress");
+    expect(labelFor(groups, "__not_started__")).toBe("Not started");
+  });
+
+  it("echoes an unmapped task state rather than rendering a blank heading", () => {
+    const { groups } = applyGroup(
+      [task({ id: "a", state: "UNKNOWN_FUTURE" as TaskState })],
+      "state",
+    );
+    expect(labelFor(groups, "UNKNOWN_FUTURE")).toBe("UNKNOWN_FUTURE");
+  });
+
+  it("translates labels on a locale switch while group keys stay identity", async () => {
+    await i18n.changeLanguage("pseudo");
+    const { groups } = applyGroup(REPO_TASKS, "repository");
+    // Keys are compared in mergeSingleRepoUnassigned/sortRepoGroups and
+    // persisted in the view's collapsedGroups — they must never localize.
+    expect(groups.map((g) => g.key).sort()).toEqual([ALPHA, BETA, "__multi__", "__unassigned__"]);
+    expect(labelFor(groups, "__multi__")).not.toBe("Multi-repo");
+    expect(labelFor(groups, "__multi__")).toMatch(/[^\p{ASCII}]/u);
+    expect(labelFor(groups, "__unassigned__")).toMatch(/[^\p{ASCII}]/u);
+    // A repository path is user data, not copy.
+    expect(labelFor(groups, ALPHA)).toBe(ALPHA);
+  });
+
+  it("translates the ungrouped label on a locale switch", async () => {
+    await i18n.changeLanguage("pseudo");
+    const { groups } = applyGroup([task({ id: "a" })], "none");
+    expect(groups[0].key).toBe("__all__");
+    expect(groups[0].label).not.toBe("All");
+    expect(groups[0].label).toMatch(/[^\p{ASCII}]/u);
+  });
+});
diff --git a/apps/web/lib/sidebar/apply-view.ts b/apps/web/lib/sidebar/apply-view.ts
index a36f9f0428..7570a5d853 100644
--- a/apps/web/lib/sidebar/apply-view.ts
+++ b/apps/web/lib/sidebar/apply-view.ts
@@ -1,6 +1,7 @@
 import { classifyTask, type TaskBucket } from "@/components/task/task-classify";
 import type { TaskSwitcherItem } from "@/components/task/task-switcher";
 import { getExecutorLabel } from "@/lib/executor-icons";
+import { t } from "@/lib/i18n";
 import { formatTaskStateLabel } from "@/lib/ui/state-labels";
 import type {
   FilterClause,
@@ -183,8 +184,21 @@ export function applySort(
   return withIndex.map((x) => x.t);
 }
 
-const UNASSIGNED_LABEL = "Unassigned";
-const MULTI_REPO_LABEL = "Multi-repo";
+/**
+ * Catalog keys, not resolved labels: a `t()` at module scope would freeze at the
+ * boot locale. `applyGroup` runs inside its callers' render, so it resolves
+ * through the module-level `t` at call time — both `useGroupedSidebarView` and
+ * the mobile task-switcher sheet already carry `i18n.language` in their memo
+ * deps for the same reason.
+ *
+ * Only `label` is copy. The group `key`s below (`__multi__`, `__unassigned__`,
+ * `__all__`, `__not_started__`) are identity: they are compared in
+ * `mergeSingleRepoUnassigned` / `sortRepoGroups`, index `STATE_GROUP_ORDER`, and
+ * are persisted in the view's `collapsedGroups`. They are never translated.
+ */
+const UNASSIGNED_LABEL_KEY = "sidebar:groupUnassigned";
+const MULTI_REPO_LABEL_KEY = "sidebar:groupMultiRepo";
+const ALL_GROUP_LABEL_KEY = "sidebar:groupAll";
 const NOT_STARTED_STATE_GROUP_KEY = "__not_started__";
 
 const STATE_GROUP_ORDER: Record<string, number> = {
@@ -255,28 +269,33 @@ function getEffectiveStateGroup(
 }
 
 const groupExtractors: Record<Exclude<GroupKey, "none">, GroupExtractor> = {
-  repository: (t) => {
-    if (t.repositories && t.repositories.length > 1) {
-      return { key: "__multi__", label: MULTI_REPO_LABEL };
+  // Parameter named `task`, not `t`: this file's other extractors and loops use
+  // `t` for a task, which shadows the imported translator. These four resolve
+  // copy, so they must not. Rename the parameter before adding a `t()` call to
+  // any of the others.
+  repository: (task) => {
+    if (task.repositories && task.repositories.length > 1) {
+      return { key: "__multi__", label: t(MULTI_REPO_LABEL_KEY) };
     }
-    if (t.repositoryPath) return { key: t.repositoryPath, label: t.repositoryPath };
-    return { key: "__unassigned__", label: UNASSIGNED_LABEL };
+    if (task.repositoryPath) return { key: task.repositoryPath, label: task.repositoryPath };
+    return { key: "__unassigned__", label: t(UNASSIGNED_LABEL_KEY) };
   },
-  workflow: (t) => {
-    if (t.workflowId) return { key: t.workflowId, label: t.workflowName ?? t.workflowId };
-    return { key: "__unassigned__", label: UNASSIGNED_LABEL };
+  workflow: (task) => {
+    if (task.workflowId)
+      return { key: task.workflowId, label: task.workflowName ?? task.workflowId };
+    return { key: "__unassigned__", label: t(UNASSIGNED_LABEL_KEY) };
   },
-  workflowStep: (t) => {
-    if (t.workflowStepId) {
-      return { key: t.workflowStepId, label: t.workflowStepTitle ?? t.workflowStepId };
+  workflowStep: (task) => {
+    if (task.workflowStepId) {
+      return { key: task.workflowStepId, label: task.workflowStepTitle ?? task.workflowStepId };
     }
-    return { key: "__unassigned__", label: UNASSIGNED_LABEL };
+    return { key: "__unassigned__", label: t(UNASSIGNED_LABEL_KEY) };
   },
-  executorType: (t) => {
-    if (t.remoteExecutorType) {
-      return { key: t.remoteExecutorType, label: getExecutorLabel(t.remoteExecutorType) };
+  executorType: (task) => {
+    if (task.remoteExecutorType) {
+      return { key: task.remoteExecutorType, label: getExecutorLabel(task.remoteExecutorType) };
     }
-    return { key: "__unassigned__", label: UNASSIGNED_LABEL };
+    return { key: "__unassigned__", label: t(UNASSIGNED_LABEL_KEY) };
   },
   // State groups use persisted task states so headings match task status labels.
   state: getTaskStateGroup,
@@ -310,7 +329,7 @@ export function applyGroup(
 
   if (groupKey === "none") {
     return {
-      groups: [{ key: "__all__", label: "All", tasks: rootTasks }],
+      groups: [{ key: "__all__", label: t(ALL_GROUP_LABEL_KEY), tasks: rootTasks }],
       subTasksByParentId,
     };
   }
diff --git a/apps/web/lib/task-colors.test.ts b/apps/web/lib/task-colors.test.ts
index ea064f3ce0..8dc3e9d652 100644
--- a/apps/web/lib/task-colors.test.ts
+++ b/apps/web/lib/task-colors.test.ts
@@ -1,10 +1,14 @@
-import { beforeEach, describe, expect, it, vi } from "vitest";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import {
   getTaskColor,
   setTaskColor,
+  TASK_COLORS,
+  TASK_COLOR_BAR_CLASS,
+  TASK_COLOR_LABEL_KEYS,
   TASK_COLORS_CHANGED_EVENT,
   TASK_COLORS_STORAGE_KEY,
 } from "./task-colors";
+import { i18n, t } from "@/lib/i18n";
 
 describe("task colors storage", () => {
   beforeEach(() => {
@@ -68,3 +72,32 @@ describe("task colors storage", () => {
     window.removeEventListener(TASK_COLORS_CHANGED_EVENT, listener);
   });
 });
+
+describe("TASK_COLOR_LABEL_KEYS", () => {
+  afterEach(async () => {
+    await i18n.changeLanguage("en");
+  });
+
+  it("covers every colour, keyed by the persisted wire value", () => {
+    expect(Object.keys(TASK_COLOR_LABEL_KEYS).sort()).toEqual([...TASK_COLORS].sort());
+    // The same wire values index the class table, so they are identity.
+    expect(Object.keys(TASK_COLOR_BAR_CLASS).sort()).toEqual([...TASK_COLORS].sort());
+  });
+
+  it("holds catalog keys that resolve to English copy", () => {
+    expect(TASK_COLOR_LABEL_KEYS.red).toBe("task:colorRed");
+    const labels = TASK_COLORS.map((c) => t(TASK_COLOR_LABEL_KEYS[c]));
+    expect(labels).toEqual(["Red", "Orange", "Yellow", "Green", "Blue", "Purple", "Pink"]);
+  });
+
+  it("stores keys rather than resolved copy, so a locale switch takes effect", async () => {
+    await i18n.changeLanguage("pseudo");
+    for (const color of TASK_COLORS) {
+      const label = t(TASK_COLOR_LABEL_KEYS[color]);
+      // A missing key would resolve to the key itself; frozen copy would stay
+      // English. Both are ruled out by an accented, non-key label.
+      expect(label).not.toBe(TASK_COLOR_LABEL_KEYS[color]);
+      expect(label).toMatch(/[^\p{ASCII}]/u);
+    }
+  });
+});
diff --git a/apps/web/lib/task-colors.ts b/apps/web/lib/task-colors.ts
index ad8aa95755..9304d006e1 100644
--- a/apps/web/lib/task-colors.ts
+++ b/apps/web/lib/task-colors.ts
@@ -14,14 +14,21 @@ export const TASK_COLOR_BAR_CLASS: Record<TaskColor, string> = {
   pink: "bg-pink-500",
 };
 
-export const TASK_COLOR_LABEL: Record<TaskColor, string> = {
-  red: "Red",
-  orange: "Orange",
-  yellow: "Yellow",
-  green: "Green",
-  blue: "Blue",
-  purple: "Purple",
-  pink: "Pink",
+/**
+ * Catalog keys, not resolved labels: a `t()` at module scope would resolve once
+ * at import and freeze at the boot locale. The colour menu resolves at render.
+ *
+ * The record keys are the persisted `TaskColor` values (localStorage, and the
+ * `TASK_COLOR_BAR_CLASS` lookup) and are never translated.
+ */
+export const TASK_COLOR_LABEL_KEYS: Record<TaskColor, string> = {
+  red: "task:colorRed",
+  orange: "task:colorOrange",
+  yellow: "task:colorYellow",
+  green: "task:colorGreen",
+  blue: "task:colorBlue",
+  purple: "task:colorPurple",
+  pink: "task:colorPink",
 };
 
 export const TASK_COLORS_STORAGE_KEY = "kandev.taskColors";
diff --git a/apps/web/lib/ui/state-labels.test.ts b/apps/web/lib/ui/state-labels.test.ts
index 503b30824a..857013f8f0 100644
--- a/apps/web/lib/ui/state-labels.test.ts
+++ b/apps/web/lib/ui/state-labels.test.ts
@@ -1,7 +1,12 @@
-import { describe, it, expect } from "vitest";
+import { afterEach, describe, it, expect } from "vitest";
 import { formatTaskStateLabel, formatTaskSessionStateLabel } from "./state-labels";
+import { i18n } from "@/lib/i18n";
 import type { TaskState, TaskSessionState } from "@/lib/types/http";
 
+afterEach(async () => {
+  await i18n.changeLanguage("en");
+});
+
 describe("formatTaskStateLabel", () => {
   it("maps known task states to human labels", () => {
     expect(formatTaskStateLabel("IN_PROGRESS")).toBe("In progress");
@@ -24,6 +29,18 @@ describe("formatTaskStateLabel", () => {
   it("falls back to the raw value for unknown states", () => {
     expect(formatTaskStateLabel("UNKNOWN_FUTURE" as TaskState)).toBe("UNKNOWN_FUTURE");
   });
+
+  it("resolves at call time, so a locale switch changes the label", async () => {
+    await i18n.changeLanguage("pseudo");
+    const label = formatTaskStateLabel("IN_PROGRESS");
+    expect(label).not.toBe("In progress");
+    expect(label).toMatch(/[^\p{ASCII}]/u);
+  });
+
+  it("leaves an unmapped wire value untranslated under any locale", async () => {
+    await i18n.changeLanguage("pseudo");
+    expect(formatTaskStateLabel("UNKNOWN_FUTURE" as TaskState)).toBe("UNKNOWN_FUTURE");
+  });
 });
 
 describe("formatTaskSessionStateLabel", () => {
@@ -35,6 +52,7 @@ describe("formatTaskSessionStateLabel", () => {
     expect(formatTaskSessionStateLabel("FAILED")).toBe("Failed");
     expect(formatTaskSessionStateLabel("CANCELLED")).toBe("Cancelled");
     expect(formatTaskSessionStateLabel("CREATED")).toBe("Created");
+    expect(formatTaskSessionStateLabel("IDLE")).toBe("Idle");
   });
 
   it("returns empty string for null/undefined", () => {
@@ -45,4 +63,16 @@ describe("formatTaskSessionStateLabel", () => {
   it("falls back to the raw value for unknown states", () => {
     expect(formatTaskSessionStateLabel("UNKNOWN" as TaskSessionState)).toBe("UNKNOWN");
   });
+
+  it("resolves at call time, so a locale switch changes the label", async () => {
+    await i18n.changeLanguage("pseudo");
+    const label = formatTaskSessionStateLabel("RUNNING");
+    expect(label).not.toBe("Running");
+    expect(label).toMatch(/[^\p{ASCII}]/u);
+  });
+
+  it("leaves an unmapped wire value untranslated under any locale", async () => {
+    await i18n.changeLanguage("pseudo");
+    expect(formatTaskSessionStateLabel("UNKNOWN" as TaskSessionState)).toBe("UNKNOWN");
+  });
 });
diff --git a/apps/web/lib/ui/state-labels.ts b/apps/web/lib/ui/state-labels.ts
index f694a1b021..f7d747dc93 100644
--- a/apps/web/lib/ui/state-labels.ts
+++ b/apps/web/lib/ui/state-labels.ts
@@ -1,35 +1,58 @@
+import { t } from "@/lib/i18n";
 import type { TaskState, TaskSessionState } from "@/lib/types/http";
 
-const TASK_STATE_LABELS: Record<TaskState, string> = {
-  CREATED: "Created",
-  SCHEDULING: "Scheduling",
-  TODO: "To do",
-  IN_PROGRESS: "In progress",
-  REVIEW: "Review",
-  BLOCKED: "Blocked",
-  WAITING_FOR_INPUT: "Waiting for input",
-  COMPLETED: "Completed",
-  FAILED: "Failed",
-  CANCELLED: "Cancelled",
+/**
+ * Catalog keys for the task-state and session-state vocabularies.
+ *
+ * Keys, not resolved labels: these are module-scope tables, so a `t()` here
+ * would resolve once at import and freeze at the boot locale. The exported
+ * helpers are plain functions called during their callers' render, so they use
+ * the module-level `t` and resolve at call time; every consumer re-renders on
+ * `languageChanged` (the sidebar and mobile switcher memos carry
+ * `i18n.language` in their deps).
+ *
+ * The record keys are the wire `TaskState` / `TaskSessionState` values and are
+ * never translated — they are compared, persisted and sent to the backend.
+ *
+ * The two vocabularies keep separate catalog keys even where the English
+ * coincides ("Completed", "Failed", …): a task and a session are different
+ * subjects, and languages that inflect for gender or number need to say them
+ * differently.
+ */
+const TASK_STATE_LABEL_KEYS: Record<TaskState, string> = {
+  CREATED: "common:taskStateCreated",
+  SCHEDULING: "common:taskStateScheduling",
+  TODO: "common:taskStateTodo",
+  IN_PROGRESS: "common:taskStateInProgress",
+  REVIEW: "common:taskStateReview",
+  BLOCKED: "common:taskStateBlocked",
+  WAITING_FOR_INPUT: "common:taskStateWaitingForInput",
+  COMPLETED: "common:taskStateCompleted",
+  FAILED: "common:taskStateFailed",
+  CANCELLED: "common:taskStateCancelled",
 };
 
-const TASK_SESSION_STATE_LABELS: Record<TaskSessionState, string> = {
-  CREATED: "Created",
-  IDLE: "Idle",
-  STARTING: "Starting",
-  RUNNING: "Running",
-  WAITING_FOR_INPUT: "Waiting for input",
-  COMPLETED: "Completed",
-  FAILED: "Failed",
-  CANCELLED: "Cancelled",
+const TASK_SESSION_STATE_LABEL_KEYS: Record<TaskSessionState, string> = {
+  CREATED: "common:sessionStateCreated",
+  IDLE: "common:sessionStateIdle",
+  STARTING: "common:sessionStateStarting",
+  RUNNING: "common:sessionStateRunning",
+  WAITING_FOR_INPUT: "common:sessionStateWaitingForInput",
+  COMPLETED: "common:sessionStateCompleted",
+  FAILED: "common:sessionStateFailed",
+  CANCELLED: "common:sessionStateCancelled",
 };
 
 export function formatTaskStateLabel(state: TaskState | null | undefined): string {
-  if (!state) return "Not started";
-  return TASK_STATE_LABELS[state] ?? state;
+  if (!state) return t("common:taskStateNotStarted");
+  // A wire value this build does not know about echoes raw rather than
+  // rendering blank — the same fallback the English table had.
+  const key = TASK_STATE_LABEL_KEYS[state];
+  return key ? t(key) : state;
 }
 
 export function formatTaskSessionStateLabel(state: TaskSessionState | null | undefined): string {
   if (!state) return "";
-  return TASK_SESSION_STATE_LABELS[state] ?? state;
+  const key = TASK_SESSION_STATE_LABEL_KEYS[state];
+  return key ? t(key) : state;
 }
diff --git a/apps/web/lib/ws/handlers/notifications.test.ts b/apps/web/lib/ws/handlers/notifications.test.ts
index f4cf81b2b1..c3fc1a548f 100644
--- a/apps/web/lib/ws/handlers/notifications.test.ts
+++ b/apps/web/lib/ws/handlers/notifications.test.ts
@@ -7,6 +7,7 @@ import {
   NOTIFICATION_EVENT_SYSTEM_UPDATE_AVAILABLE,
 } from "@/lib/notifications/events";
 import type { BackendMessageMap } from "@/lib/types/backend";
+import { i18n } from "@/lib/i18n";
 import { registerNotificationsHandlers } from "./notifications";
 
 vi.mock("@/lib/notifications/sound", () => ({
@@ -21,6 +22,8 @@ const OTHER_TASK_ID = "task-2";
 const MESSAGE_TITLE = "Agent needs your answer";
 const MESSAGE_BODY = 'The agent asked a question on "Task one".';
 const notificationMock = vi.fn();
+const TURN_FINISHED = NOTIFICATION_EVENT_SESSION_TURN_FINISHED;
+const TURN_FINISHED_FALLBACK_TITLE = "Agent turn finished";
 type SemanticNotificationMessage =
   | BackendMessageMap["session.clarification_requested"]
   | BackendMessageMap["session.turn_finished"]
@@ -286,12 +289,12 @@ describe("semantic session notification malformed payloads", () => {
 
     getHandler(
       makeStore(),
-      "session.turn_finished",
+      TURN_FINISHED,
     )(
       makeMessage(
         "turn-1",
-        "session.turn_finished",
-        "Agent turn finished",
+        TURN_FINISHED,
+        TURN_FINISHED_FALLBACK_TITLE,
         'The agent finished a turn on "Task one".',
       ),
     );
@@ -299,7 +302,7 @@ describe("semantic session notification malformed payloads", () => {
     expect(invoke).toHaveBeenCalledWith("show_native_notification", {
       request: expect.objectContaining({
         eventId: "session.turn_finished:turn-1",
-        title: "Agent turn finished",
+        title: TURN_FINISHED_FALLBACK_TITLE,
         body: 'The agent finished a turn on "Task one".',
       }),
     });
@@ -340,3 +343,76 @@ describe("office inbox notification delivery", () => {
     });
   });
 });
+
+describe("empty-payload fallback copy", () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    vi.stubGlobal(
+      "Notification",
+      Object.assign(notificationMock, { permission: "granted" as NotificationPermission }),
+    );
+  });
+
+  afterEach(async () => {
+    vi.unstubAllGlobals();
+    await i18n.changeLanguage("en");
+  });
+
+  function fireEmpty(action: "session.turn_finished" | "session.clarification_requested") {
+    const message = {
+      ...makeMessage("empty-1", action, "", ""),
+      payload: {
+        task_id: TASK_ID,
+        session_id: SESSION_ID,
+        occurrence_id: "o-1",
+        title: "",
+        body: "",
+      },
+    } as SemanticNotificationMessage;
+    getHandler(makeStore(), action)(message);
+  }
+
+  it("renders the English fallback when the backend sends no title or body", () => {
+    fireEmpty(TURN_FINISHED);
+    expect(notificationMock).toHaveBeenCalledWith(TURN_FINISHED_FALLBACK_TITLE, {
+      body: "The agent finished a turn.",
+    });
+
+    notificationMock.mockClear();
+    fireEmpty("session.clarification_requested");
+    expect(notificationMock).toHaveBeenCalledWith("Agent needs your answer", {
+      body: "The agent asked a question.",
+    });
+  });
+
+  it("resolves the fallback per notification, not once at handler registration", async () => {
+    // Registering under `en` and firing under `pseudo` is the regression: the
+    // handlers are registered once when the WS client starts, so a fallback
+    // resolved at registration would stay English for the rest of the session.
+    const handler = getHandler(makeStore(), TURN_FINISHED);
+    await i18n.changeLanguage("pseudo");
+    handler({
+      ...makeMessage("empty-2", TURN_FINISHED, "", ""),
+      payload: {
+        task_id: TASK_ID,
+        session_id: SESSION_ID,
+        occurrence_id: "o-2",
+        title: "",
+        body: "",
+      },
+    } as SemanticNotificationMessage);
+
+    const [title, options] = notificationMock.mock.calls[0] as [string, { body: string }];
+    expect(title).not.toBe(TURN_FINISHED_FALLBACK_TITLE);
+    expect(title).toMatch(/[^\p{ASCII}]/u);
+    expect(options.body).toMatch(/[^\p{ASCII}]/u);
+  });
+
+  it("prefers a backend-supplied title over the fallback", () => {
+    getHandler(
+      makeStore(),
+      TURN_FINISHED,
+    )(makeMessage("kept-1", TURN_FINISHED, "Custom title", "Custom body"));
+    expect(notificationMock).toHaveBeenCalledWith("Custom title", { body: "Custom body" });
+  });
+});
diff --git a/apps/web/lib/ws/handlers/notifications.ts b/apps/web/lib/ws/handlers/notifications.ts
index fddaa91c9f..1ab6cd49e7 100644
--- a/apps/web/lib/ws/handlers/notifications.ts
+++ b/apps/web/lib/ws/handlers/notifications.ts
@@ -6,6 +6,9 @@ import {
   NOTIFICATION_EVENT_SYSTEM_UPDATE_AVAILABLE,
 } from "@/lib/notifications/events";
 import { playWaitingForInputSound } from "@/lib/notifications/sound";
+// Module-level `t`, resolved at call time: these handlers are plain callbacks
+// invoked by the WS client, not components, so there is no hook to bind.
+import { t } from "@/lib/i18n";
 import { nativeNotifications } from "@/lib/desktop/native-notification-client";
 import type { AppState } from "@/lib/state/store";
 import type {
@@ -39,10 +42,18 @@ function showDesktopNotification(payload: NotificationPayload): void {
   new Notification(payload.title, { body: payload.body });
 }
 
+/**
+ * Catalog keys for the copy shown when the backend sends an empty title/body.
+ * Keys rather than resolved strings: the handlers are registered once when the
+ * WS client starts, so resolving here would pin the fallback to whichever locale
+ * was active at registration. `t` runs inside the handler, per notification.
+ */
+type NotificationFallbackKeys = { titleKey: string; bodyKey: string };
+
 function registerNotificationHandler(
   store: StoreApi<AppState>,
   eventType: string,
-  fallback: Pick<NotificationPayload, "title" | "body">,
+  fallback: NotificationFallbackKeys,
 ) {
   return (message: { id?: string; payload: NotificationPayload }) => {
     const sessionId = message.payload?.session_id;
@@ -55,8 +66,8 @@ function registerNotificationHandler(
     playWaitingForInputSound();
     const payload = {
       ...message.payload,
-      title: message.payload.title || fallback.title,
-      body: message.payload.body || fallback.body,
+      title: message.payload.title || t(fallback.titleKey),
+      body: message.payload.body || t(fallback.bodyKey),
     };
     const occurrenceID =
       message.id ??
@@ -86,24 +97,24 @@ export function registerNotificationsHandlers(store: StoreApi<AppState>): WsHand
       store,
       NOTIFICATION_EVENT_SESSION_TURN_FINISHED,
       {
-        title: "Agent turn finished",
-        body: "The agent finished a turn.",
+        titleKey: "common:notificationTurnFinishedTitle",
+        bodyKey: "common:notificationTurnFinishedBody",
       },
     ),
     [NOTIFICATION_EVENT_SESSION_CLARIFICATION_REQUESTED]: registerNotificationHandler(
       store,
       NOTIFICATION_EVENT_SESSION_CLARIFICATION_REQUESTED,
       {
-        title: "Agent needs your answer",
-        body: "The agent asked a question.",
+        titleKey: "common:notificationClarificationTitle",
+        bodyKey: "common:notificationClarificationBody",
       },
     ),
     [NOTIFICATION_EVENT_OFFICE_INBOX_ITEM]: registerNotificationHandler(
       store,
       NOTIFICATION_EVENT_OFFICE_INBOX_ITEM,
       {
-        title: "New inbox item",
-        body: "A new item needs your attention.",
+        titleKey: "common:notificationInboxItemTitle",
+        bodyKey: "common:notificationInboxItemBody",
       },
     ),
     [NOTIFICATION_EVENT_SYSTEM_UPDATE_AVAILABLE]: (message: { payload: UpdateAvailablePayload }) =>
diff --git a/apps/web/src/locales/en/common.json b/apps/web/src/locales/en/common.json
index f92ac0a61e..ff31a0335d 100644
--- a/apps/web/src/locales/en/common.json
+++ b/apps/web/src/locales/en/common.json
@@ -183,6 +183,12 @@
   "noFilesFound": "No files found.",
   "noFoldersHerePickThisOne": "No folders here — pick this one or go up",
   "noResults": "No results.",
+  "notificationClarificationBody": "The agent asked a question.",
+  "notificationClarificationTitle": "Agent needs your answer",
+  "notificationInboxItemBody": "A new item needs your attention.",
+  "notificationInboxItemTitle": "New inbox item",
+  "notificationTurnFinishedBody": "The agent finished a turn.",
+  "notificationTurnFinishedTitle": "Agent turn finished",
   "notInstalled": "Not installed",
   "notYetInstalled": "Not yet installed",
   "officeIsNotEnabledForThis": "Office is not enabled for this runtime.",
@@ -277,6 +283,14 @@
   "searchQueriesAreLimitedTo200": "Search queries are limited to 200 characters.",
   "searchTaskContents": "Search task contents…",
   "select": "Select",
+  "sessionStateCancelled": "Cancelled",
+  "sessionStateCompleted": "Completed",
+  "sessionStateCreated": "Created",
+  "sessionStateFailed": "Failed",
+  "sessionStateIdle": "Idle",
+  "sessionStateRunning": "Running",
+  "sessionStateStarting": "Starting",
+  "sessionStateWaitingForInput": "Waiting for input",
   "settings": "Settings",
   "shell": "Shell",
   "shellCommandPlusSlashCommandSkills": "Shell command you can run in the secondary instance, plus slash-command <2>skills</2> you can ask the agent to run during the workflow.",
@@ -294,6 +308,17 @@
   "todos": "Todos",
   "taskLoading": "Loading task...",
   "tasks": "Tasks",
+  "taskStateBlocked": "Blocked",
+  "taskStateCancelled": "Cancelled",
+  "taskStateCompleted": "Completed",
+  "taskStateCreated": "Created",
+  "taskStateFailed": "Failed",
+  "taskStateInProgress": "In progress",
+  "taskStateNotStarted": "Not started",
+  "taskStateReview": "Review",
+  "taskStateScheduling": "Scheduling",
+  "taskStateTodo": "To do",
+  "taskStateWaitingForInput": "Waiting for input",
   "taskUnavailable": "Task unavailable",
   "taskUnavailableDescription": "We could not load this task. It may have been deleted or you may not have access.",
   "theAgentForksKandevToYourAccount": "The agent forks <1>{{repo}}</1> to your GitHub account and opens a PR from your fork, credited to you",
diff --git a/apps/web/src/locales/en/sidebar.json b/apps/web/src/locales/en/sidebar.json
index 19cd62b742..5f05b592cf 100644
--- a/apps/web/src/locales/en/sidebar.json
+++ b/apps/web/src/locales/en/sidebar.json
@@ -36,6 +36,9 @@
   "expandGroup": "Expand {{label}}",
   "expandSidebar": "Expand sidebar",
   "filtersAndSort": "Filters and sort",
+  "groupAll": "All",
+  "groupMultiRepo": "Multi-repo",
+  "groupUnassigned": "Unassigned",
   "home": "Home",
   "improveKandev": "Improve Kandev",
   "inbox": "Inbox",
diff --git a/apps/web/src/locales/en/task.json b/apps/web/src/locales/en/task.json
index 69f45e5eaf..b30465127f 100644
--- a/apps/web/src/locales/en/task.json
+++ b/apps/web/src/locales/en/task.json
@@ -197,6 +197,13 @@
   "collapseSubtasks": "Collapse subtasks",
   "collapseToolbar": "Collapse toolbar",
   "color": "Color",
+  "colorBlue": "Blue",
+  "colorGreen": "Green",
+  "colorOrange": "Orange",
+  "colorPink": "Pink",
+  "colorPurple": "Purple",
+  "colorRed": "Red",
+  "colorYellow": "Yellow",
   "command": "Command",
   "commandCopied": "Command copied",
   "commandFailed": "Command failed",
diff --git a/apps/web/src/locales/pseudo/common.json b/apps/web/src/locales/pseudo/common.json
index 286f40d1a8..f41dad6dc4 100644
--- a/apps/web/src/locales/pseudo/common.json
+++ b/apps/web/src/locales/pseudo/common.json
@@ -183,6 +183,12 @@
   "noFilesFound": "Ńō ƒĩĺēś ƒōũńď.",
   "noFoldersHerePickThisOne": "Ńō ƒōĺďēŕś ĥēŕē — ƥĩćķ ţĥĩś ōńē ōŕ ĝō ũƥ",
   "noResults": "Ńō ŕēśũĺţś.",
+  "notificationClarificationBody": "Ţĥē àĝēńţ àśķēď à qũēśţĩōń.",
+  "notificationClarificationTitle": "Àĝēńţ ńēēďś ŷōũŕ àńśŵēŕ",
+  "notificationInboxItemBody": "À ńēŵ ĩţēḿ ńēēďś ŷōũŕ àţţēńţĩōń.",
+  "notificationInboxItemTitle": "Ńēŵ ĩńƀōx ĩţēḿ",
+  "notificationTurnFinishedBody": "Ţĥē àĝēńţ ƒĩńĩśĥēď à ţũŕń.",
+  "notificationTurnFinishedTitle": "Àĝēńţ ţũŕń ƒĩńĩśĥēď",
   "notInstalled": "Ńōţ ĩńśţàĺĺēď",
   "notYetInstalled": "Ńōţ ŷēţ ĩńśţàĺĺēď",
   "officeIsNotEnabledForThis": "Ōƒƒĩćē ĩś ńōţ ēńàƀĺēď ƒōŕ ţĥĩś ŕũńţĩḿē.",
@@ -277,6 +283,14 @@
   "searchQueriesAreLimitedTo200": "Śēàŕćĥ qũēŕĩēś àŕē ĺĩḿĩţēď ţō 200 ćĥàŕàćţēŕś.",
   "searchTaskContents": "Śēàŕćĥ ţàśķ ćōńţēńţś…",
   "select": "Śēĺēćţ",
+  "sessionStateCancelled": "Ćàńćēĺĺēď",
+  "sessionStateCompleted": "Ćōḿƥĺēţēď",
+  "sessionStateCreated": "Ćŕēàţēď",
+  "sessionStateFailed": "Ƒàĩĺēď",
+  "sessionStateIdle": "Ĩďĺē",
+  "sessionStateRunning": "Ŕũńńĩńĝ",
+  "sessionStateStarting": "Śţàŕţĩńĝ",
+  "sessionStateWaitingForInput": "Ŵàĩţĩńĝ ƒōŕ ĩńƥũţ",
   "settings": "Śēţţĩńĝś",
   "shell": "Śĥēĺĺ",
   "shellCommandPlusSlashCommandSkills": "Śĥēĺĺ ćōḿḿàńď ŷōũ ćàń ŕũń ĩń ţĥē śēćōńďàŕŷ ĩńśţàńćē, ƥĺũś śĺàśĥ-ćōḿḿàńď <2>śķĩĺĺś</2> ŷōũ ćàń àśķ ţĥē àĝēńţ ţō ŕũń ďũŕĩńĝ ţĥē ŵōŕķƒĺōŵ.",
@@ -294,6 +308,17 @@
   "todos": "Ţōďōś",
   "taskLoading": "Ĺōàďĩńĝ ţàśķ...",
   "tasks": "Ţàśķś",
+  "taskStateBlocked": "Ɓĺōćķēď",
+  "taskStateCancelled": "Ćàńćēĺĺēď",
+  "taskStateCompleted": "Ćōḿƥĺēţēď",
+  "taskStateCreated": "Ćŕēàţēď",
+  "taskStateFailed": "Ƒàĩĺēď",
+  "taskStateInProgress": "Ĩń ƥŕōĝŕēśś",
+  "taskStateNotStarted": "Ńōţ śţàŕţēď",
+  "taskStateReview": "Ŕēvĩēŵ",
+  "taskStateScheduling": "Śćĥēďũĺĩńĝ",
+  "taskStateTodo": "Ţō ďō",
+  "taskStateWaitingForInput": "Ŵàĩţĩńĝ ƒōŕ ĩńƥũţ",
   "taskUnavailable": "Ţàśķ ũńàvàĩĺàƀĺē",
   "taskUnavailableDescription": "Ŵē ćōũĺď ńōţ ĺōàď ţĥĩś ţàśķ. Ĩţ ḿàŷ ĥàvē ƀēēń ďēĺēţēď ōŕ ŷōũ ḿàŷ ńōţ ĥàvē àććēśś.",
   "theAgentForksKandevToYourAccount": "Ţĥē àĝēńţ ƒōŕķś <1>{{repo}}</1> ţō ŷōũŕ ĜĩţĤũƀ àććōũńţ àńď ōƥēńś à ƤŔ ƒŕōḿ ŷōũŕ ƒōŕķ, ćŕēďĩţēď ţō ŷōũ",
diff --git a/apps/web/src/locales/pseudo/sidebar.json b/apps/web/src/locales/pseudo/sidebar.json
index 8ebd505afa..73f46b2263 100644
--- a/apps/web/src/locales/pseudo/sidebar.json
+++ b/apps/web/src/locales/pseudo/sidebar.json
@@ -36,6 +36,9 @@
   "expandGroup": "Ēxƥàńď {{label}}",
   "expandSidebar": "Ēxƥàńď śĩďēƀàŕ",
   "filtersAndSort": "Ƒĩĺţēŕś àńď śōŕţ",
+  "groupAll": "Àĺĺ",
+  "groupMultiRepo": "Ḿũĺţĩ-ŕēƥō",
+  "groupUnassigned": "Ũńàśśĩĝńēď",
   "home": "Ĥōḿē",
   "improveKandev": "Ĩḿƥŕōvē Ķàńďēv",
   "inbox": "Ĩńƀōx",
diff --git a/apps/web/src/locales/pseudo/task.json b/apps/web/src/locales/pseudo/task.json
index 5b6d1feb23..cb1a7fce54 100644
--- a/apps/web/src/locales/pseudo/task.json
+++ b/apps/web/src/locales/pseudo/task.json
@@ -197,6 +197,13 @@
   "collapseSubtasks": "Ćōĺĺàƥśē śũƀţàśķś",
   "collapseToolbar": "Ćōĺĺàƥśē ţōōĺƀàŕ",
   "color": "Ćōĺōŕ",
+  "colorBlue": "Ɓĺũē",
+  "colorGreen": "Ĝŕēēń",
+  "colorOrange": "Ōŕàńĝē",
+  "colorPink": "Ƥĩńķ",
+  "colorPurple": "Ƥũŕƥĺē",
+  "colorRed": "Ŕēď",
+  "colorYellow": "Ŷēĺĺōŵ",
   "command": "Ćōḿḿàńď",
   "commandCopied": "Ćōḿḿàńď ćōƥĩēď",
   "commandFailed": "Ćōḿḿàńď ƒàĩĺēď",