You can't use CultureInfo to convert languages: it's only applicable for date and number formats, that sort of thing.
To do machine natural language translation is a major job: Microsoft have an API:
Microsoft Translator[
^] and so does Google:
https://cloud.google.com/translate/v2/pricing[
^] - however I haven't used either of them, and I understand that they are both paid-for services after some point.
You may be able to get away with scraping the Google translate page:
Google Translate[
^] but I'd imagine that will be a fair amount of work, and may "break" when they change the page design (as they do quite often).