Set LC_ALL=C at git status to make sure in English

Fix https://github.com/magicmonty/bash-git-prompt/pull/170#issuecomment-142516122

gitstatus.py

@@ -74,7 +74,8 @@ def get_stash():
 
 # `git status --porcelain --branch` can collect all information
 # branch, remote_branch, untracked, staged, changed, conflicts, ahead, behind
-po = Popen(['git', 'status', '--porcelain', '--branch'], stdout=PIPE, stderr=PIPE)
+po = Popen(['git', 'status', '--porcelain', '--branch'], env={'LC_ALL': 'C'},
+           stdout=PIPE, stderr=PIPE)
 stdout, sterr = po.communicate()
 if po.returncode != 0:
     sys.exit(0)  # Not a git repository