authentication and calendar-sync passwords keyed (214 -> 163)

Authentication reaches zero -- sign-in, bootstrap, forgot and reset password. These
are the first words a new account reads, which is why the brief ranked them above
the larger screens.

DavAppPasswords had the third toLocaleDateString(undefined, ...) in the shell; it now
uses useFormat().date like the other two.

DebugPanel's three labels are keyed too. Worth knowing rather than acting on: that
panel is rendered behind showDebug, which Background.tsx hardcodes to false, so it
never appears. Keyed rather than deleted because removing it is not my call.

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

@@ -360,6 +360,21 @@
       "resetTitle": "Reset the password for {{email}}?",
       "resetBody": "A new password is generated and shown to you once — it is not stored anywhere and cannot be looked up afterwards. Their existing password stops working immediately, and they are signed out everywhere.",
       "resetLinuxNote": "Their Linux account ({{osUser}}) is not affected: it has no password, and SSH keys are unchanged."
+    },
+    "dav": {
+      "newDevice": "New device",
+      "create": "Create",
+      "none": "No devices yet.",
+      "placeholder": "Pixel 9, iPad, Thunderbird…",
+      "revoke": "Revoke",
+      "delete": "Delete",
+      "copyFailed": "Could not copy — select and copy manually",
+      "createFailed": "Could not create the app password",
+      "revoked": "Revoked — that device will stop syncing",
+      "revokeFailed": "Could not revoke",
+      "deleteFailed": "Could not delete",
+      "copyField": "Copy {{field}}",
+      "copied": "{{what}} copied"
     }
   },
   "header": {
@@ -484,5 +499,41 @@
     "submitted": "Bug report submitted",
     "failed": "Failed to submit bug report",
     "submit": "Submit"
+  },
+  "auth": {
+    "signInTitle": "Welcome Back",
+    "signInSubtitle": "Sign in to your account",
+    "emailOrUsername": "Email or username",
+    "password": "Password",
+    "forgotPassword": "Forgot password?",
+    "emailPlaceholder": "you@example.com",
+    "passwordPlaceholder": "Your password",
+    "forgotTitle": "Forgot Password",
+    "forgotSubtitle": "Enter your email to receive a reset link",
+    "email": "Email",
+    "backToLogin": "Back to login",
+    "checkEmail": "Check your email",
+    "checkEmailHint": "Click it to reset your password.",
+    "resetOk": "Password reset successfully. Please sign in.",
+    "verifying": "Verifying…",
+    "invalidLink": "Invalid Link",
+    "invalidLinkHint": "This reset link is invalid or has expired.",
+    "resetTitle": "Reset Password",
+    "resetSubtitle": "Enter your new password",
+    "confirmPassword": "Confirm Password",
+    "minChars": "Min 12 characters",
+    "confirmPlaceholder": "Confirm your password",
+    "bootstrapTitle": "Welcome, Admin",
+    "bootstrapSubtitle": "Create your administrator account",
+    "name": "Name",
+    "username": "Username",
+    "namePlaceholder": "Your name",
+    "adminEmailPlaceholder": "admin@example.com",
+    "bootstrapOk": "Administrator account created. Please sign in.",
+    "debug": {
+      "controls": "Controls:",
+      "camera": "Camera:",
+      "model": "Model:"
+    }
   }
 }