Steps to replicate the issue:

• Go to Serbian Wikipedia, which uses LanguageConverter: https://www.mediawiki.org/wiki/Writing_systems/LanguageConverter
• Go to most any article page; Here are two examples on my test page: https://sr.wikipedia.org/wiki/User:Dungodung/parsoid

What happens?:

• You'll see empty space/no string at all ( ) instead of text wherever there is a -{text}- instance (either directly or through templates)

What should have happened instead?:
You should see text