Behat/Behat — pull request #675 by stof (2014-12-29 09:23:18+00:00)
Title: Fix the testsuite when the OS locale is not English

The environment is inherited in subprocesses, so the LANG variable should be reset to be sure that the default language is English when running Behat in the scenarios.
Setting the variable to an invalid locale is easier than ensuring there is no variable at all.