[tx-robot] updated from transifex
Add rename() method to OC_VCategories.
Remove debug output
Add test for renaming non-existing category.
Merge pull request #3430 from owncloud/vcategory_rename

Add rename() method to OC_VCategories.
[tx-robot] updated from transifex
Merge branch 'master' into files_encryption

Conflicts:
	apps/files_trashbin/l10n/nn_NO.php