Thanks for the information. I believe this should now be fixed, notably with Russian being translated enough for WordPress.org to generate language packs. Can you upgrade to beta 5 and ensure your translation packs are up to date (on the same WordPress updates page) and let me know if you’re still having trouble?
As I understand, these visual anomalies occurred in lines whose translation is submitted but awaiting editor confirmation. In the meantime, I have translated the plugin to Russian, so I have set German to reproduce the error. The first screenshot is version 6.4.1-beta4, the second is 6.4.1-beta5. The error is fixed.