Mastodon is now on the translation platform Crowdin. So far it seems like a much better interface for translating
You can help by either submitting translations or proofreading existing ones!
@Gargron did you guys considered #weblate as a platform for translations?
@rskikuli It's a closed chapter
Server run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!