Not sure if this is a feature request or if it’s already in here somewhere and I just need to be told where…
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Edit: facepalm I’m just noticing this is a community for the Boost for Lemmy app, not the official site. Please ignore me.
In your account Settings, scroll down to the Languages section and select Undetermined and other languages you’d like to see.It’s not 100% foolproof, because as others have stated, the language tag isn’t required. But it significantly reduced most of the foreign-language posts I was seeing on the All feed, without impacting the feed in a negative way (AFAIK). For the remainders, you can just block the community if needed.