Policy: Do not translate CLI scripts

The current state of CLI scripts is sometimes people translate things, sometimes they don't. We should be consistent. And I argue we should be consistent about never translating in cli scripts.

In MDL-55206 - I asked the question:

Is common practice?
Is 'demanded' by users?

I'm not being insensitive to other languages here, it just feels like the CLI is a bit of an english dominated world. I am not sure if its better that we should just have a blanket policy of no translation in them. (There are some parallels with https://moodle.org/mod/forum/discuss.php?d=218027)

In that issue, Jun also reported some results from the ecosystem:

To look into this, I tried changing my Ubuntu desktop's language to Japanese and showed the help text of the following programs:
Default linux commands such as ls, mv, cp, etc - Translated to Japanese
PHP (php -h) - Only in English
Python (python -h) - Only in English
Java (java -h) - Translated to Japanese
Behat (vendor/bin/behat -h) - Only in English
PHPUnit (vendor/bin/phpunit -h) - Only in English
Git (git --help) - Only in English