Fixup localization verification

[mstv]

Fixes #9273

Proposed changes

• Restore the working loc verification from 8da72f4
• Stage all files which have been modified by the build process, a.o. by set_version_to.py

Test methodology

• CI build

Test environment(s)

• AppVeyor

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✒️ I contribute this code under The Developer Certificate of Origin.

[RussKie]

I've been thinking overnight - we want to build with the hash of the original PR. So perhaps we want to run the loc check first, and only if it passes perform soft reset and build. This way we don't need to do gymnastics of resetting back, etc.
What do you think?

[mstv]

It is not about resetting but about having committed the .xlf files, which have been merged with the master.

Building twice is also gymnastics and will take too much time IMO.

So rather make the script which injects the git info, aware of the CI build and override the hash with the APPVEYOR_PULL_REQUEST_HEAD_COMMIT.

[RussKie]

It is working, though is giving strange output

[mstv]

It is working, though is giving strange output

That's why I must reset LASTEXITCODE.