activity, capabilities, chat history and the locale picker (21 -> 2)

The locale picker's labels are now AUTONYMS computed from Intl -- each language named
in its own language, so "Português europeu" reads as Portuguese whichever locale the
UI is in. That is the convention for a language picker and the useful behaviour:
somebody who cannot read the current language still has to find theirs.

CapabilityPage interpolated the capability KIND into six strings by lowercasing it in
code. "skill" does not lowercase into a Portuguese noun, so kind is a parameter now.

What is left is two strings, both deliberate: see the next commit message.

src/apps/officer-web/locales/en-GB.json

@@ -484,7 +484,8 @@
     "calendar": "Calendar",
     "contacts": "Contacts",
     "appStore": "App store",
-    "marketplace": "Marketplace"
+    "marketplace": "Marketplace",
+    "codeEditor": "Code Editor"
   },
   "theme": {
     "pillTitle": "Theme: {{name}}  ·  ctrl+shift+←/→ cycle · ctrl+shift+space browse · ctrl+shift+f {{starAction}}",
@@ -672,5 +673,30 @@
       "interrupted": "Interrupted"
     },
     "failedWithCode": "Failed (exit {{code}})"
+  },
+  "activity": {
+    "title": "Activity",
+    "backgroundTasks": "Background tasks",
+    "detached": "Detached",
+    "backToList": "Back to the list",
+    "selectTask": "Select a task to follow its live output",
+    "noneRunning": "none running"
+  },
+  "passkeyGate": {
+    "setUp": "Set up your passkey"
+  },
+  "chatHistory": {
+    "loadFailed": "Could not load this conversation: {{reason}}"
+  },
+  "capability": {
+    "frontmatter": "Frontmatter",
+    "noMatches": "No matches",
+    "emptyFile": "Empty file",
+    "createFailed": "Could not create the {{kind}}",
+    "deleteFailed": "Could not delete the {{kind}}",
+    "searchPlaceholder": "Search {{kind}}…",
+    "selectOne": "Select a {{kind}}",
+    "selectToView": "Select a {{kind}} to view its contents",
+    "delete": "Delete"
   }
 }