Just a reminder that #Fedilab has a feature to detect the language of the message you are writing (disabled by default).
If you are a polyglot, it can warn you when you have selected the wrong language.
You can enable it in Settings > Compose > Check language when posting.
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@apps
This would be a great feature for the web interface to have also.
Folks do seem to forget the language selection, or pick the wrong one which breaks translation 😔