The problem is that these chains are not even in English language, the other chains are correct, with my language. Examples of strings that I need:
and some appear to be more characteristic of the subject.
I get the impression that the chains have overwritten when importing from a local file. Is there any way to recover them without typing them one by one.
I don't think I quite understand what exactly you mean by "chain" but if you restart the application (right upper corner in the administration) all the missing resources are automatically added for all the languages.
Which version of nopCommerce/theme do you use, so I can double check if these resources are missing by any chance?