[Закрытые] help with translations - some of theme are gone

Background of the issue:
I am trying to fix the translations on the English and German versions of the site. Please see the short film for more details: скрытая ссылка. The issue can be seen on this page: скрытая ссылка. of on the screen скрытая ссылка

Symptoms:
Some translations are missing or not visible, particularly headings from the Inusti theme.

Questions:
Why are some translations missing or not visible?
How can I fix the missing translations for the Inusti theme?