Created attachment 2323 Patch to fix the translation "Tab" has to be translated with "Reiter" and not with "Tabulator" in case of GUI tabs. Terminal has the term of "New tab" == "Neuer Reiter", so "Reiter" is the translation to be used here. The attached patch should fix the translation.
For a German translator...
Created attachment 2429 Proper update of the translation of the affected strings The patch is against latest SVN and replaces Tabulator by Reiter as suggested by Bernhard. This was just plain wrong, in case I translated that way, sorry. The patch also improves the wording in general for the affected strings.