I've just noticed that docs/TRANSLATING.md needs to be updated now that we've added embed_translations to Jamulus.pro:
In the section Adding a new language, there is no longer any need to add .qm files to Jamulus.pro or a resource file, nor to run lrelease. I think lupdate is still needed.
I will do the changes soon and check for anything else required. This Issue is to ensure it doesn't get forgotten.