Translation is part of RoboHelp 2020 as described on my site. RH2020 Translations (grainge.org)
and in the online help.
You can either use a machine translation service or work with a translation agency, preferably one that has experience of working with RoboHelp. Obviously an agency should be better as whilst machine translation has improved enormously, it is not alway ideal for anything technical.
See https://helpx.adobe.com/contact/enterprise-support.other.html#robohelp for your Adobe Support options. The email link tcssup@adobe.com is recommended as it reaches a team dedicated to Technical Communication Suite products including RoboHelp.
________________________________________________________
My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.
Use the menu (bottom right) to mark the Best Answer or Highlight particularly useful replies. Found the answer elsewhere? Share it here.