Hello, firstly, thanks for the project! I was wondering whether language support could be included in content submission (/admin/new form). According to this: https://www.w3.org/TR/activitypub/ it would seem only a matter of adding something such as '"@context": {"@language": "xx"},'. If not wrong, nothing is sent now.
I'm interested in this as well. Adding the language on a post would enable to provide that meta information to the fediverse, eg for automatic filtering or translating.
But it would also enable features on the UI, eg to show posts of a specific language.
Apart from this, but that would probably be a separate issue, I'm also interested in multilingual posts.