@FediTips@social.growyourown.services
You can search for posts by language in Mastodon by including the "language:" operator in your search. However, it requires knowing the language code for the language you want to include or exclude.
I've done a list of all the language codes used by Mastodon here:
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️ https://fedi.tips/language-codes-used-by-mastodon
For example if you include language:fr in your search terms it will just show results of posts in French.
This is totally separate from the language filter system for timelines:
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️ https://fedi.tips/setting-your-language-preferences-on-mastodon-and-filtering-out-posts-in-other-languages