It seems to me that, up to NW2010, there was a localized (for example German) online-help available and These help Contents were also mady available in a Joint document as a "Manual". It seems that this practise has stopped since NW2013.
I sincerely hope that Nintex will provide again this Kind of collateral to Support international (i.e., non English-speaking) Workflow Designers with respect to the Claim "Workflow for everyone".
I know from many discussions that several Nintex Partners are happy to contribute to These translations.