clap localization improvements

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)

[Copilot]

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[cakebaker]

Done :)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/misc/tee (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/du/threshold. tests/du/threshold is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[cakebaker]

I noticed that you removed all crate::locale::setup_localization(util_name); calls in the non-test code. Is that correct?

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/du/threshold. tests/du/threshold is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[sylvestre]

Yes, it seems unnecessary

[cakebaker]

I don't know if you have seen that tests/du/threshold fails. For some reason an error message of du changes. On main:

$ cargo run -q du --threshold
error: a value is required for '--threshold <SIZE>' but none was supplied

For more information, try '--help'.

And on the branch with the changes from this PR:

$ cargo run -q du --threshold
error: a value is required for '--threshold <SIZE>' but none was supplied

  [possible values: ]

For more information, try '--help'.

[sylvestre]

du fixed with a test to make sure we identify the issue more quickly :)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)