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An EXTREMELY Simple Guide to Mastodon (for when someone says it's too complicated to catch on)
(www.staygrounded.online)
A community dedicated to fediverse news and discussion.
Fediverse is a portmanteau of "federation" and "universe".
Getting started on Fediverse;
Some instances have built in auto translation these days, works quite well in my experience.
But if language filtering works everywhere except when following hashtags that sounds like a bug and you should probably see if there is an issue for it on the Mastodon bugtracker, and if not make one.