Merge pull request #4030 from owncloud/more-themable-strings

apps/files/appinfo/remote.php

apps/files_sharing/templates/public.php

apps/user_ldap/templates/settings.php

apps/user_webdavauth/templates/settings.php

core/templates/installation.php

core/templates/layout.base.php

core/templates/layout.guest.php

core/templates/layout.user.php

core/templates/mail.php

lib/defaults.php

settings/templates/admin.php