Quick CSS Switcher

Hi, thanks for the theme, it’s great!

I have to implement a very simplified language switcher into my site. Different language texts are marked by a <div class="langEN">English Text</div> and <div class="langDE">German Text</div>. The idea is to show only the text in the language choosen by the website-user.

In the test phase I just add the hide-css tag into the Quick CSS field: For displaying only the English text .langDE {display:none!important;} and for displaying only German text .langEN {display:none!important;}. For the user I would need something like a Quick CSS switcher. So, in the menu there should be two buttons for choosing either the one Quick CSS code or the other. Are there any easy solutions (due to update reasons preferred as WordPress-Admin modifications and not PHP-coding).

Thanks a lot and kind regards,
Christian