Revert "Remove layout glitch-soc settings"

Reverts 0d61985713. Re-enables the ability to toggle between single/multi column ui.

app/javascript/flavours/glitch/locales/en.json

@@ -64,6 +64,12 @@
   "keyboard_shortcuts.bookmark": "to bookmark",
   "keyboard_shortcuts.secondary_toot": "to send toot using secondary privacy setting",
   "keyboard_shortcuts.toggle_collapse": "to collapse/uncollapse toots",
+  "layout.auto": "Auto",
+  "layout.desktop": "Desktop",
+  "layout.hint.auto": "Automatically chose layout based on “Enable advanced web interface” setting and screen size.",
+  "layout.hint.desktop": "Use multiple-column layout regardless of the “Enable advanced web interface” setting or screen size.",
+  "layout.hint.single": "Use single-column layout regardless of the “Enable advanced web interface” setting or screen size.",
+  "layout.single": "Mobile",
   "media_gallery.sensitive": "Sensitive",
   "moved_to_warning": "This account is marked as moved to {moved_to_link}, and may thus not accept new follows.",
   "navigation_bar.app_settings": "App settings",
@@ -133,6 +139,7 @@
   "settings.image_backgrounds_media_hint": "If the post has any media attachment, use the first one as a background",
   "settings.image_backgrounds_users": "Give collapsed toots an image background",
   "settings.inline_preview_cards": "Inline preview cards for external links",
+  "settings.layout": "Layout:",
   "settings.layout_opts": "Layout options",
   "settings.media": "Media",
   "settings.media_fullwidth": "Full-width media previews",