Hello,
+1 to have a clean XLIFF in the good version to translate it with DEEPL.
ACOLAD company developped an interface similar to DEEPL that translate Articulate XLIFF. I tested it with Rise XLIFF and it's work well. You must contact an Acolad contact to have access to the application because it's not available from website. https://www.acolad.com/fr.html
DEEPL good points : Intuitive, respect RGPD, no to expensive => very important criteria because people using RISE are business expert and not IT expert nor instructional designer. And it is the target of Rise and argument. Then XLIFF extrated from RISE must work in a tool dedicated to this same target (intuitive too) => ACOLAD have similar propreties.
An other solution for Articulate could be : propose an add on to connect Deepl API key to Articulate account to propose the translation uploaded in RISE directly.
The structure of the XLIFF from Articulate is not terrible : according to my IT, there is no <closing tag>. You know the tag is closed when you see the next <opening tag>.
Hope Articulate will be able to give us a planning for the upgrade as soon as possible !