Guys, I can’t translate some lines. If I save the line with the text "Widgets" now, after refreshing the page, it will not be translated again. Can anyone advise what?

You have the same key for four different strings. You cannot translate strings with duplicate keys. Check where the keys are derived (custom theme?) and contact the developer asking him/they to change the keys. 

12 minutes ago, Sonya* said:

and contact the developer asking him

I wrote to them, thanks.

Thank you for coming to us with the issue, yes you are correct the issue with the theme language tab key assigning, for anyone who is installing all 3 versions may encounter this error

i have fixed this and will soon update the package with the fix.