What the title says.
I dream of Flow boards in multiple languages (example of a feedback page) where it is easy for people to just filter out the contents they want to read; for example I may choose to see threads in English, French and Italian but not in German or Chinese. I believe that, among other things, this is key to proper feedback centralization and board maintenance.
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Recommendation: By default, only show posts in languages that the reader speaks, as specified by babel box contents.
(Also, maybe consider having a way to translate others' messages, to aid cross-language communication.)