[damned-lies] utils.py: use Unicode quotes

[Claude Paroz <claudep src gnome org>]

commit 91e79b74e4ca55d5c54a6431aff73b7eef582648
Author: Rafael Fontenelle <rffontenelle gmail com>
Date:   Thu Aug 30 12:47:12 2018 +0000

    utils.py: use Unicode quotes

 stats/utils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/stats/utils.py b/stats/utils.py
index bf989b13..a5d85e23 100644
--- a/stats/utils.py
+++ b/stats/utils.py
@@ -508,7 +508,7 @@ def check_po_quality(pofile, filters):
     http://docs.translatehouse.org/projects/translate-toolkit/en/latest/commands/pofilter.html
     """
     if not os.path.exists(pofile):
-        return _("The file '%s' does not exist") % pofile
+        return _("The file “%s” does not exist") % pofile
     status, out, errs = run_shell_command(
         ['pofilter', '--progress=none', '--gnome', '-t'] +
         list(filters) +