https://bugzilla.redhat.com/show_bug.cgi?id=1308190
--- Comment #19 from William H. Haller bill@awmach.org --- All right.
The problem is that ./usr/share/locale/ja.po is a file in fedora 22 (and I'm pretty sure in other releases as well) and not a directory, so when it tries to create ./usr/share/locale/ja.po/LC_MESSAGES/tomoe-gtk.mo it fails.
That isn't a surprise since I'm pretty sure it should be /usr/share/locale/ja/LC_MESSAGES/tomoe-gtk.mo and not ja.po