OKAY THIS WORKS THIS WORKS

app/javascript/mastodon/locales/defaultMessages.json

@@ -658,6 +658,22 @@
       {
         "defaultMessage": "Logout",
         "id": "navigation_bar.logout"
+      },
+      {
+        "defaultMessage": "Your current layout is:",
+        "id": "layout.current_is"
+      },
+      {
+        "defaultMessage": "Mobile",
+        "id": "layout.mobile"
+      },
+      {
+        "defaultMessage": "Desktop",
+        "id": "layout.desktop"
+      },
+      {
+        "defaultMessage": "Auto",
+        "id": "layout.auto"
       }
     ],
     "path": "app/javascript/mastodon/features/compose/index.json"

app/javascript/mastodon/locales/en.json

@@ -79,6 +79,10 @@
   "home.column_settings.show_reblogs": "Show boosts",
   "home.column_settings.show_replies": "Show replies",
   "home.settings": "Column settings",
+  "layout.auto": "Auto",
+  "layout.current_is": "Your current layout is:",
+  "layout.desktop": "Desktop",
+  "layout.mobile": "Mobile",
   "lightbox.close": "Close",
   "loading_indicator.label": "Loading...",
   "media_gallery.toggle_visible": "Toggle visibility",