Make it compatible with the Sound Naming spec

Guilherme Marçal Silva requested to merge raploz/kamoso:kf6-sound-spec into master

Important: This change is meant for KF6/Plasma 6 only, so wait until it's safe to merge.

Make it compatible with the sound naming spec. See https://invent.kde.org/raploz/blue-ocean-sound-theme/-/issues/6

https://specifications.freedesktop.org/sound-naming-spec/sound-naming-spec-latest.html

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