Every time you have the "TRANSLATION MISSING" error, go to the "Edit default theme content" section.
Then there will be a notice to you which translation functions are missing, please click on the "filter this page" section to see the missing translation functions.
Default Theme Content is a section containing the text and title of the sections/functions in the Theme. The reason these texts are not in Theme Settings is because it is related to multi-language. That's why we've arranged the text/titles of the apps/sections/features into the Default Theme Content panel. You can easily change them according to your purposes but still automatically translate them into multiple languages.
The easiest way to find a keyword you want to edit is to use the search engine. There are many tabs, and each tab has a lot of content, so if you find it manually, it will take time. Please copy the text you want to change and paste it into the search; it's easy!
Please watch the video below to learn how to edit the Default theme Content :
To use the translate automatically, install the "Translate & Adapt".
After installing the app, please click on "Apps" and select the "Translate & Adapt" application > select the language to be translated and select "Default theme content" > "Auto translate"
After successful translation, check the entire website again and the problems will be fixed.