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The developers of Mastodon would like some help with translating it into other languages. If you speak a language other than English, you can help translate Mastodon's interface at:
https://crowdin.com/project/mastodon
If you're interested in following the techy details of Mastodon development and updates, the official Mastodon Engineering account is at:
@feditips @MastodonEngineering Unfortunately, Crowdin is proprietary software so that's a huge downside. 
Free software should be also developed by free software tools.
Genuine question: is there a free software translation platform?
Let us know any time 
, @weblate If Mastodon's translation platform will become Weblate, I will be very likely to contribute translations since I tend to translate the software I use.
But other translation services are fine, too, as long it's free software.
@feditips @MastodonEngineering Yes.
First, there's #Weblate. I strongly recommend it, I have recently started using it for my own games. #Minetest also uses it.
Then, there's translatewiki.net. #FreeCol uses it and a number of other projects. Also good.
There are also #Zanata and #Pootle but I have no experience with these and they may be outdated (check for yourself).
Then, there are translation services tailored towards specific software: