When a translated string is identical to the source string that indicates that the translation is still pending.
I believe there is currently no way to tell for which translations the translation is identical to the source?
Two possible places in which it could be implemented (either or both):
  1. Filter in the list/table view (UPDATE: Just realized this is already available as "Translation" -> "Same as source")
  2. As a QA Check (this could still be helpful perhaps - but less urgent now that I found the filter)