Untranslatable – Your grade is /’passed’-‘failed’/

I translated the latest version into Serbian, 100% of it, yet the quiz result (Your grade is ‘passed’/’failed’) remains untranslated.

Here is the screenshot:
[IMG]https://i64.tinypic.com/14w9lg.png[/IMG]

Please help!
Once I check the translation in context, I will submit it to the Serbian WP localization team for review as my contribution to your project.