Fix German date parsing.

CLDR changed German from having a mix of 3- and 4-character abbreviated month
names (such as "Juli" and "Aug"[ust]) to having only 4-character names by
adding periods to the end of abbreviated names (giving "Juli" and "Aug.").
This means that a date formatted with the old data (by jb-mr1, say) can't
be parsed with the new data (in jb-mr2, say). Work around this by doing what
icu4c's SimpleDateFormat::parse does --- accepting "xxx" as a match for "xxx.".

Bug: https://code.google.com/p/android/issues/detail?id=59383
Bug: 10511599
Change-Id: I021ea8ffeea37ea2cae943a84cdd2babb337301d