locale fix needs also a call to POSIX::setlocale

Unfortunately the fix for https://github.com/bentglasstube/WWW-Jawbone-Up/issues/1 does not work on my box. However, if a call to POSIX::setlocale() is forced, then it works.

Only t/03_score.t and t/04_band.t used to fail on my system, so I fixed only these two files.