Yay. Finally.
This is cool!
Social Media shouldn't be english forever.
If anybody is interested how to do this in any ActivityPub software, see Section 4.7:
https://www.w3.org/TR/activitystreams-core/#naturalLanguageValues
Add 'Map' to `name`, `summary` or `content` and make it an object like
{"nameMap": {"en": "awesome", de: "juhu", und: "yay"}