uu: updated error message for mv on overwriting non-empty directory inside destination directory

[asder8215]

This PR implements the solution mentioned by @tertsdiepraam and @PThorpe92 in #5102 to provide a clearer move error message on overwriting a non-empty directory in the destination directory with the same name as source directory.

I added and modified a couple of error messages within the locales directory of the mv command. I did use Google Translate to translate the error message in English to French, so I'm not sure if it is well translated.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/mv/dir2dir. tests/mv/dir2dir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/part-fail. tests/mv/part-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/perm-1. tests/mv/perm-1 is passing on 'main'. Maybe you have to rebase?

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/mv/dir2dir. tests/mv/dir2dir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/part-fail. tests/mv/part-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/perm-1. tests/mv/perm-1 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)
Skip an intermittent issue tests/tail/overlay-headers (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)

[asder8215]

I noticed that my mv command produces this error msg in the scenario mentioned in #5102. For context, my system is on GNU coreutils 9.8-2:

mv: cannot overwrite 'e/dir': Directory not empty

this error msg was proposed by Paul here: https://lists.gnu.org/archive/html/bug-coreutils/2023-07/msg00032.html and it seems to be implemented in GNU coreutils 9.8-2

This is different from the previous error msg that rust coreutils produces:

mv: cannot move 'dir' to 'e/dir': Directory not empty

Currently, I have it set with the error message proposed by PThorpe92:

mv: cannot overwrite: A non-empty directory: '{}' exists at destination

Should I change it to the one that GNU coreutils use as of 9.8-2?

[asder8215]

Moreover, I'm unsure why the Android/Test build is failing.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/mv/dir2dir. tests/mv/dir2dir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/part-fail. tests/mv/part-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/perm-1. tests/mv/perm-1 is passing on 'main'. Maybe you have to rebase?

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/mv/dir2dir. tests/mv/dir2dir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/part-fail. tests/mv/part-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/perm-1. tests/mv/perm-1 is passing on 'main'. Maybe you have to rebase?
Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/mv/dir2dir. tests/mv/dir2dir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/part-fail. tests/mv/part-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/perm-1. tests/mv/perm-1 is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

[sylvestre]

GNU testsuite comparison:

GNU test failed: tests/mv/dir2dir. tests/mv/dir2dir is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/part-fail. tests/mv/part-fail is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/mv/perm-1. tests/mv/perm-1 is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

please fix them
please reopen when it is ready!