to my beloved instance, soc.ialis.me, it seems we have a fair amount of both french and english in our local timeline. there's now a solution to ensure that every toot has both, thanks to @cs who created a little translation bot. simply mention it along with a two letter ISO language code and it will reply with the translation:

@translator fr

@wxl @translator @cs for which languages does this work?
@wxl @translator es @cs @EmilJacobs let's test it. What a great idea!
@EmilJacobs @cs @translator ja @wxl Spanish works! How about Japanese?
@y6nH [ja] @EmilJacobs @cs @wxl スペイン語の作品!日本語はどうですか。
@y6nH @translator en Dit is een test om te kijken hoe het gaat van Nederlands naar Engels
@EmilJacobs [en] @y6nH @ mastodon. social this is a test to see how it goes from Dutch to English