ColourPicker: Source builds and installs but doesn't run. Snap package runs but seems to be missing fonts or has unicode issues.

Fedora 30, all dependencies installed. No warnings or errors in output of sudo python3 setup.py install.

App shows up in gnome’s app list correctly. But if I try to open it, nothing ever happens. And it does seem to be running according to

➜ ps aux | grep pick
adriano  13307  0.1  0.2 432544 60080 ?        Sl   12:00   0:00 /usr/bin/python3 /usr/local/bin/pick-colour-picker

I tried the snap package and that one does run but it seems like there’s a unicode or font issue where no text displays. Screenshot: https://imgur.com/PfN85fN and https://imgur.com/Y0V1Hd7