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"
```

src/settings/ProfileSettingsTab.tsx

@@ -82,7 +82,7 @@ export const ProfileSettingsTab: FC<Props> = ({ client }) => {
           <AvatarInputField
             id="avatar"
             name="avatar"
-            label={t("Avatar")}
+            label={t("common.avatar")}
             avatarUrl={avatarUrl}
             userId={userId}
             displayName={displayName}
@@ -94,7 +94,7 @@ export const ProfileSettingsTab: FC<Props> = ({ client }) => {
         <InputField
           id="userId"
           name="userId"
-          label={t("Username")}
+          label={t("common.username")}
           type="text"
           disabled
           value={client.getUserId()!}
@@ -104,11 +104,11 @@ export const ProfileSettingsTab: FC<Props> = ({ client }) => {
         <InputField
           id="displayName"
           name="displayName"
-          label={t("Display name")}
+          label={t("common.display_name")}
           type="text"
           required
           autoComplete="off"
-          placeholder={t("Display name")}
+          placeholder={t("common.display_name")}
           defaultValue={displayName}
           data-testid="profile_displayname"
         />