This is a feature request targeting Dorico 5 or later. (Maybe too late for Dorico 4.)
I personally prefer to use Dorico in English. However, sometimes I may have needs to show my work and / or operating procedures to my instructors on my campus. Only some of my instructors can read English. In such cases I have to restart Dorico which is time-consuming (pretty sensitive in Japanese culture to ask instructors to have patience with this).
Therefore, I am wondering whether Dorico can support switching user interface language without rebooting Dorico application itself.
P.S.: I also found Dorico 3.1.0 crashes everytime I was trying to read MusicXML files generated by “SmartScore Music-to-XML Music Notation Recognition” app (purchased from Mac App Store). If Daniel (or other Dorico dev members) have any interests in this, please let me know and I will find some time to pack up crash reports and send them to his email address.