Update ThemingController.php
Changed wording according to discussion at Transifex. See https://www.transifex.com/nextcloud/nextcloud/translate/#de/$/121491259?issue=yes Aligned ending of error messages
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Changed wording according to discussion at Transifex. See https://www.transifex.com/nextcloud/nextcloud/translate/#de/$/121491259?issue=yes Aligned ending of error messages