* fix: grpc implementation of custom message texts
* fix: proto definition of RemoveHumanAvatar in mgmt api
* fix: DeleteCustomText in view (respect key)
* feat: add get custom message text to admin api
* feat: read custom message texts from files
* feat: get languages in apis
* feat: get languages in apis
* feat: get languages in apis
* feat: pr feedback
* feat: docs
* feat: merge main