Adjust translation provider source #1376
Description
To resolve issues with various capability API consumers, the translation tuples are no longer part of the capability API.
Instead there is a boolean capability to indicate whether there are any providers and then the existing server API should be contacted:
https://docs.nextcloud.com/server/latest/developer_manual/client_apis/OCS/ocs-translation-api.html#get-available-translation-options
Server PR: nextcloud/spreed#10317