Fortunately there is a relatively simple way to fix this: there is a mod on the SH4 Mods forum, which adds the GWX 2.0 speechpack to the sim. Install using JSGME. Enable when playing U-Boote, disable when playing US subs.
The pack does still allow American voices occasionally, but the most important faults have been rectified.
Strange that the devs didn't include German speech for the U-Boote; IL2 Sturmovik has had different languages for the various nationalities for ages so it isn't exactly breaking new ground. I suppose the devs ran into a deadline and there simply wasn't any time left to add the German voices.
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