setup: don't ship i18n directory

The directory was never actually used at runtime and other programs
don't ship it either.

setup.py

@@ -256,7 +256,7 b" if sys.platform == 'linux2' and os.uname"
         packages.extend(['hgext.inotify', 'hgext.inotify.linux'])
 
 datafiles = []
-for root in ('templates', 'i18n', 'help'):
+for root in ('templates', 'help'):
     for dir, dirs, files in os.walk(root):
         dirs[:] = [x for x in dirs if not x.startswith('.')]
         files = [x for x in files if not x.startswith('.')]