Set LC_ALL to 'C'.

Parsing of some git outputs relies on the english language being used, so
explicitly set the locale before running any of them.

gitstats

@@ -14,6 +14,8 @@ import sys
 import time
 import zlib
 
+os.environ['LC_ALL'] = 'C'
+
 GNUPLOT_COMMON = 'set terminal png transparent size 640,240\nset size 1.0,1.0\n'
 ON_LINUX = (platform.system() == 'Linux')
 WEEKDAYS = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')