Incorrect usage of language fallback

Description

Steps to reproduce:
1. In code, try to start a content approval on content that does not have an approval definition with this code:

contentRepository.Save(newblock as IContent, SaveAction.RequestApproval | SaveAction.Default, AccessLevel.NoAccess);

Expected: Exception with text
Actual: Exception with "missing text": "[Missing text '/validation/approval/definitionrequired' for 'Swedish']"