fix: Use C locale in diagnostics

[buhtz]

C locale is always used when extracting version strings from external tools in diagnostics output.

In addition: Renamed "match" variable because it is a reserved keyword in newer Python versions.

Related #1479

[aryoda]

I am not sure if setting LC_ALL will really work (at least I had a lot of problems with that with R).

If do a quick test the other way around it does not work but still print English output on my machine (U22.04):

env LC_ALL=de_DE.UTF-8 rsync --version

Perhaps it works only with C as value...

[buhtz]

On a bash I have to do export LC_ALL= instead of env LC_ALL=. Don't know why "env" does not work. I was using env wrong in the past using && to connect it with a command: env LC_ALL=C && encfs is of course wrong.

I installed italian local on my machine (via sudo dpkg-reconfigure locales on Debian 11). And then I checked it inside a Python REPL using the Popen(cmd, env=...). This worked fine.

[aryoda]

On a bash I have to do export LC_ALL= instead of env LC_ALL=.

Good to know, THX for testing!

I have justs asked the user of the underlying issue to to a test with env, he could also do test the without env to be sure that at least one variant is working on his computer...

[aryoda]

Good work, ready to merge!

OP did successfully test that LC_ALL=C works (with or without env doesn't matter here, since in Python we use popen: #1479 (comment)