Migrate more strings to translation keys (#11669)

src/components/views/context_menus/RoomNotificationContextMenu.tsx

@@ -70,7 +70,7 @@ export const RoomNotificationContextMenu: React.FC<IProps> = ({ room, onFinished
 
     const mentionsOption: JSX.Element = (
         <IconizedContextMenuRadio
-            label={_t("Mentions & keywords")}
+            label={_t("notifications|mentions_keywords")}
             active={notificationState === RoomNotifState.MentionsOnly}
             iconClassName="mx_RoomNotificationContextMenu_iconBellMentions"
             onClick={wrapHandler(() => setNotificationState(RoomNotifState.MentionsOnly))}