l10n: port env for translation + add french

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env-S. tests/env/env-S is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

[cakebaker]

I don't know if you have seen it, the changes break a test:

thread 'tests::test_error_cases' panicked at src/uu/env/src/env.rs:957:9:
assertion `left == right` failed
  left: "env-error-backslash-c-not-allowed"
 right: "'\\c' must not appear in double-quoted -S string"

[github-actions]

GNU testsuite comparison:

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

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env-S. tests/env/env-S is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)

[cakebaker]

GNU test failed: tests/env/env-S

It looks like it breaks a GNU test :|

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/env/env-S. tests/env/env-S is passing on 'main'. Maybe you have to rebase?

[github-actions]

GNU testsuite comparison:

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

[github-actions]

GNU testsuite comparison:

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