Add explicit locale during tests
Add explicit locale during tests

This hopefully fixes an issue in travis where the locale would sometimes
change to German during the different tests.

rolandgeider/wger,petervanderdoes/wger,petervanderdoes/wger,wger-project/wger,wger-project/wger,wger-project/wger,petervanderdoes/wger,rolandgeider/wger,rolandgeider/wger,rolandgeider/wger,petervanderdoes/wger,wger-project/wger