The de_AT translation for February has been "Feber" since it was first introduced, but despite having grown up in Austria and living there for 20 years, I have never heard that word before. According to Wikipedia it exists, but everyone I know, newspapers, TV and radio news, all use "Februar". I believe "Feber" should be changed to "Februar" because that's the word people actually use.
A patch for this submitted as: http://sourceware.org/ml/libc-locales/2012-q2/msg00112.html I committed it.
Follow-up patch submitted in <http://sourceware.org/ml/libc-locales/2012-q4/msg00010.html>; committed.