Missing or translated tags-locale or tags-tips strings
"tags-locale:C" and "tips-locale:C" strings have special meaning for GIMP.
Unfortunately, instead of changing accordingly, some of them have been translated or have been left empty.
#. This is a special string to specify the language identifier to
#. * look for in the gimp-tags-default.xml file. Please translate the
#. * C in it according to the name of the po file used for
#. * gimp-tags-default.xml. E.g. lithuanian for the translation,
#. * that would be "tags-locale:lt".
#. This is a special string to specify the language identifier to
#. look for in the gimp-tips.xml file. Please translate the C in it
#. according to the name of the po file used for gimp-tips.xml.
#. E.g. for the german translation, that would be "tips-locale:de".
I sent a patch to fix all of these problems.