Revert "Enable Polish translation again", for now

[Sobak]

This reverts commit 70bd5e0.

While the docs do build, I belive there's at least a few specific action points we should tackle before we open them up to the world.

I really wanna avoid going into the infinite beta mode, i.e. "lemme just do this >>one more thing<< and then we'll surely release" but at the same time I want to stay responsible and as such, I wanna make sure few things are done before we start showing this up for people in Poland.

• some infra problem, the Polish option does appear in the select but it leads to 404
• getting rid of some terribly outdated pages: to stay specific I would say lets at least deal with files without En-Revision in most used reference/* directories
• update parameter names to match the PHP's source code: while many files are technically up-to-date (from revcheck's standpoint) they are using translated parameter names. I believe this is what all documentations used to do in the old days. Now that we have named parameters it means that people will get invalid information from the manual. I hope that there's some script in doc-base that I can utilize to find such cases, otherwise I might end up writing something myself
• generally speaking I believe we should run all kinds of QA scripts that are available. Better to do it now that the documentation is small rather than much later
• minor point: I remembered now that there are some translations embedded in the phd itself. I think I even wrote a script eons ago that can show if the files went out of sync with the English version. I have no clue if phd received much love in recent years but the Polish translations file in its repo should be checked as well

[Sobak]

Hi @Girgias

for some reason I'm unable to assign reviewers to my PRs. I thought that perhaps it's a paid feature on GitHub but I've seen you do it before so now I'm unsure. Anyhow, can you please have a look?

[github-actions]

🚀 Commit 6abd27b Deployed on https://web-php-pr-989.preview.thephp.foundation

[Girgias]

One needs to be a maintainer of a repo to be able to have a PR assigned to one-self.