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Have you tried Garbro? The latest version added support for that title.

I'm not here to disappoint you, but the steam version of Saya no Uta is made with the 'Diesel Engine' which is a really weird engine. I've tried messing with it before as well but the files just can't be extracted by normal means, you need reverse engineering in order to: extract, repack, or do anything to those files. I still don't know why they changed the engine from N2system to Diesel. But you can still try to translate the original one (yes it does not support win10 but I think you can find a solution for that) It's been a while since I tried to edit those files though. Maybe they made a tool for this. And sorry for not being very helpful.