Bug 7377 Ver 4.0.2 starts in East Asian Language

Revert "GrampsLocale: Don't set  to 'C' if LANG is en_US"

This reverts commit bdd336f38e.

It turns out that Gtk's having an 'en' translation isn't the only reason
for doing this: GtkBuilder uses $LANGUAGE too, and will look for an english
translation of strings in our Glade files. Since there's no en.po or
en_US.po, it will go to the next language in the list and produce confusing
results.

gramps/gen/utils/grampslocale.py

@@ -441,7 +441,11 @@ class GrampsLocale(object):
                 lang = '.'.join((check_lang[0], 'UTF-8'))
 
         os.environ["LANG"] = lang
-        os.environ["LANGUAGE"] = ':'.join([l for l in self.language])
+        #We need to convert 'en' and 'en_US' to 'C' to avoid confusing
+        #GtkBuilder when it's retrieving strings from our Glade files
+        #since we have neither an en.po nor an en_US.po.
+        os.environ["LANGUAGE"] = ':'.join(['C' if l in ('en', 'en_US') else l
+                                           for l in self.language])
 
         # GtkBuilder uses GLib's g_dgettext wrapper, which oddly is bound
         # with locale instead of gettext. Win32 doesn't support bindtextdomain.