Since COLR seems to be winning the color war mainly due to the fact it is “backwards compatible” and works with variable font technology and with version 1 it now also supports gradients, etc, it is not worth the effort to implement support for color formats that will become obsolete in the near future.
We will consider more translations if customers request them. It is pretty easy to make your own translation, just make a copy of lang.en as located in the Lang folder:
C:\Program Files\High-Logic FontCreator\Lang
Change the extension to match the language, and update the content, e.g. _meta.locale and provide correct translations, and finally and restart FontCreator.