Rated 4 out of 5 stars
seems to be the case, that german locales have gone buggy in version 2.2 (have worked perfectly in 2.1)
the error marks line 23 in options.xul and says " it works.
it seems to be that german translation is a little bit missing of translation ;-)
many translations are filled with blank strings. :-(
if you´re interested i can do that for you....