Media display improvements

- built in fullwidth styling
 - letterbox settings toggle
 - media no longer counts towards height when making toot-collapsing
measurements

app/javascript/mastodon/locales/defaultMessages.json

@@ -1226,9 +1226,17 @@
         "defaultMessage": "Preview collapsed toot media",
         "id": "settings.image_backgrounds_media"
       },
+      {
+        "defaultMessage": "Media",
+        "id": "settings.media"
+      },
+      {
+        "defaultMessage": "Letterbox media",
+        "id": "settings.media_letterbox"
+      },
       {
         "defaultMessage": "User preferences",
-        "id": "settings.global_settings"
+        "id": "settings.preferences"
       },
       {
         "defaultMessage": "Close",

app/javascript/mastodon/locales/en.json

@@ -157,10 +157,12 @@
   "settings.collapsed_statuses": "Collapsed toots",
   "settings.enable_collapsed": "Enable collapsed toots",
   "settings.general": "General",
-  "settings.global_settings": "User preferences",
   "settings.image_backgrounds": "Image backgrounds",
   "settings.image_backgrounds_media": "Preview collapsed toot media",
   "settings.image_backgrounds_users": "Give collapsed toots an image background",
+  "settings.media": "Media",
+  "settings.media_letterbox": "Letterbox media",
+  "settings.preferences": "User preferences",
   "settings.wide_view": "Wide view (Desktop mode only)",
   "status.cannot_reblog": "This post cannot be boosted",
   "status.collapse": "Collapse",