Sie müssten eine Skript Manager Erweiterung installieren damit sie dieses Skript installieren können
Currently, this script is hardcoded for German and English, as those are the two I need. If there's demand, I might make that more flexible and add the possibility to include more than just two languages.
Note: It seems like Google somehow "catches" the URL change and just reloads components dynamically – so that, when expanding the comments, you seem to be back to the "original language". If that happens to you, after clicking the link simply hit the key to reload the page – still easier than having to edit the URL manually :)