- adds the shortcut to the shortcuts window
- expands the error message so people know what to do
- adds a warning at build-time when some beautifiers are missing
I didn't include rustfmt in the list because it should be installed through rustup, so it makes more sense to only warn at runtime. Since the manifest doesn't include autopep8 either, I'm wondering if it shouldn't be bundled too? python-deps.json would be the place I guess (updated with the flatpak-builder-tools script)?
Follow-up from !362 (merged)