Refactor KeyboardShortcuts component (#5835)

app/javascript/mastodon/locales/defaultMessages.json

@@ -923,6 +923,79 @@
     ],
     "path": "app/javascript/mastodon/features/home_timeline/index.json"
   },
+  {
+    "descriptors": [
+      {
+        "defaultMessage": "Keyboard Shortcuts",
+        "id": "keyboard_shortcuts.heading"
+      },
+      {
+        "defaultMessage": "Hotkey",
+        "id": "keyboard_shortcuts.hotkey"
+      },
+      {
+        "defaultMessage": "Description",
+        "id": "keyboard_shortcuts.description"
+      },
+      {
+        "defaultMessage": "to reply",
+        "id": "keyboard_shortcuts.reply"
+      },
+      {
+        "defaultMessage": "to mention author",
+        "id": "keyboard_shortcuts.mention"
+      },
+      {
+        "defaultMessage": "to favourite",
+        "id": "keyboard_shortcuts.favourite"
+      },
+      {
+        "defaultMessage": "to boost",
+        "id": "keyboard_shortcuts.boost"
+      },
+      {
+        "defaultMessage": "to open status",
+        "id": "keyboard_shortcuts.enter"
+      },
+      {
+        "defaultMessage": "to move up in the list",
+        "id": "keyboard_shortcuts.up"
+      },
+      {
+        "defaultMessage": "to move down in the list",
+        "id": "keyboard_shortcuts.down"
+      },
+      {
+        "defaultMessage": "to focus a status in one of the columns",
+        "id": "keyboard_shortcuts.column"
+      },
+      {
+        "defaultMessage": "to focus the compose textarea",
+        "id": "keyboard_shortcuts.compose"
+      },
+      {
+        "defaultMessage": "to start a brand new toot",
+        "id": "keyboard_shortcuts.toot"
+      },
+      {
+        "defaultMessage": "to navigate back",
+        "id": "keyboard_shortcuts.back"
+      },
+      {
+        "defaultMessage": "to focus search",
+        "id": "keyboard_shortcuts.search"
+      },
+      {
+        "defaultMessage": "to un-focus compose textarea/search",
+        "id": "keyboard_shortcuts.unfocus"
+      },
+      {
+        "defaultMessage": "to display this legend",
+        "id": "keyboard_shortcuts.legend"
+      }
+    ],
+    "path": "app/javascript/mastodon/features/keyboard_shortcuts/index.json"
+  },
   {
     "descriptors": [
       {