I'm currently unable to find any misplaced string...

I suspect the "fast builds" may cause the bug and the "full build" may fix it, and I probably checked right after a full build.

I'll test this locally soon (full build in one lang followed by a fast build in another lang) to see if I can reproduice it.

The build cycle is "build english then build french then build japanese", so having english on french is unnoticable, and you noticed french on japanese and japanese on english, so it looks to match with the build pattern.

We may temporarily deactivate fast builds it needed (if it's long to fix) I'll know more after my local tests.