I have a problems with the translations of the nested content should anybody have idea where the problem is? I tried with Proworks migration package but without result.

Hi, do you mean translations as in diffrent languages inside the content ? - If you have done this with something like Vorto inside a nested content element, then its a bit of a pain when you go to v8 - because language translations can really only be at the top level (e.g properties directly on the content item) - not inside nested properties on paper what you need to do is duplicate the nested property for each language, and then put that into each culture. unforturnaly this isn't 'easy' in any sense of the word. and takes quite a bit of fangling.

Thank you Kevin, i decided to manually recreate the whole structure of the site, because im new into "Umbraco world" and should be good to understand it corectly.