Remove gravatar and no-avatar functionality, prepare for default avatars even more and reword some stuff

Conflicts:
	apps/files_encryption/lib/crypt.php

Conflicts:
	settings/templates/personal.php

Conflicts:

	lib/mail.php

Using ksort now, instead of prefilling the commonlanguages array.

revert changes to fbbc76f2 because master is very unstable right now

Also add russian and arabic to the common languages.

don´t show negative numbers. this is only a quickfix. I still dont get why the Shared folder can be bigger than the root folder. Perhaps a inconsitency in the filecache?

respect coding style