Remove stray debug
Fix German translation for branch
Fix online state handling

Before this commit, parts of mirall were aware of the state, but not all.
Also, the state was not set back to Connected again in all cases. This
commit introduces the following changes:

- Make QuotaInfo a member of Account
- QuotaInfo and Folder (EtagJob) can put the client in disconnected mode
- FolderMan now disables etag-polling when offline

Fixes #1459
Fixes #1441