Migrate action, common, a11y translation keys

```
move () {
  FROM=$1 TO=$2 find public/locales -type f -exec sh -c 'jq ".$TO = .\"$FROM\" | del(.\"$FROM\") | del(..|nulls) | select(length > 0)" {} | sponge {}' \;
}

move "Avatar" "common.avatar"
move "Camera" "common.camera"
move "Close" "action.close"
move "Copied!" "common.copied"
move "Copy" "action.copy"
move "Copy link" "action.copy_link"
move "Encrypted" "common.encrypted"
move "Go" "action.go"
move "Home" "common.home"
move "Invite" "action.invite"
move "Loading…" "common.loading"
move "Microphone" "common.microphone"
move "No" "action.no"
move "Not encrypted" "common.unencrypted"
move "Password" "common.password"
move "Profile" "common.profile"
move "Username" "common.username"
move "Video" "common.video"
move "Register" "action.register"
move "Remove" "action.remove"
move "Settings" "common.settings"
move "Sign in" "action.sign_in"
move "Sign out" "action.sign_out"
move "Submit" "action.submit"
move "User menu" "a11y.user_menu"
move "Audio" "common.audio"
move "Display name" "common.display_name"
```

public/locales/sv/app.json

@@ -4,5 +4,8 @@
   "{{count, number}}_one": "{{count, number}}",
   "{{count, number}}_other": "{{count, number}}",
   "{{displayName}} is presenting": "{{displayName}} presenterar",
-  "{{displayName}}, your call has ended.": "{{displayName}}, ditt samtal har avslutats."
+  "{{displayName}}, your call has ended.": "{{displayName}}, ditt samtal har avslutats.",
+  "common": {},
+  "action": {},
+  "a11y": {}
 }