This new feature (in the next Mastodon version) is great, but many people write in 2 languages (like me, Dutch and English). So I have to set this to automatically, cause I can only set a maximum of 1 language.
My proposal is to add an extra advanced option called 'advanced' where you can specify multiple languages using ISO language codes (e.g. en,nl). When this is set the language detection only have to detect between these languages.