Waves in L10N aren't localized

I must admit that I’m at my wit’s end. I’ve been looking all day for a fix and have found many people with a similar problem but no solution.

While our text localizes perfectly, any wave file we try to localize only stays in English. I tried with a few textures to see if the whole L10N folder was problematic, but those seem to work just fine. If anyone knows a solution or, at the very least, a direction to continue my investigation, I would be tremendously grateful.
Thank you

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Hey! I have the same problem as you. Did you fix it?