I have a client who's need is to have Nintex form in different local languages but it seems that default texts like Attach file and error messages cannot be localized. Is that really so? Please help.
There are separate install files for international languages. Do you know if any where used? Also, the SharePoint configuration of language packs also has an impact on the language used on the site. So the combination of the two will be what you need.
This is something that we are aware of and working towards. I don't have a release date for that yet, but it has been discussed and is on the roadmap.