Note, for de-DE there is an warning when you install:

koha-translate --install de-DE --dev kohadev
tmpl_process3.pl: Warning: unconsistent %s count: (1/0):
  line:   39530
  msgid:  "Bookings for %s › Bookings › Circulation › Koha"
  msgstr: "Buchungen f�r › Buchungen › Ausleihe › Koha"