[pitivi] render: Fix missing translated string

[Thibault Saunier <tsaunier src gnome org>]

commit e4169170ee4195d278d748f1b856bbb9a1b7a2cf
Author: Thibault Saunier <tsaunier igalia com>
Date:   Fri May 18 16:58:59 2018 -0400

    render: Fix missing translated string

 pitivi/render.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/pitivi/render.py b/pitivi/render.py
index 3ebe6fae..3052c486 100644
--- a/pitivi/render.py
+++ b/pitivi/render.py
@@ -853,7 +853,7 @@ class RenderDialog(Loggable):
     def _showRenderErrorDialog(self, error, unused_details):
         primary_message = _("Sorry, something didn’t work right.")
         secondary_message = _("An error occurred while trying to render your "
-                              "project.") + self.__additional_debug_info(str(error)) + (
+                              "project.") + self.__additional_debug_info(str(error)) + _(
             "You might want to check our troubleshooting guide or file a bug report. "
             "The GStreamer error was:") + "\n\n<i>" + str(error) + "</i>"