Add pot files for translating pandas documentation
- [ ] closes #xxxx (Replace xxxx with the GitHub issue number)
- [ ] [Tests added and passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#writing-tests) if fixing a bug or adding a new feature
- [ ] All [code checks passed](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit).
- [ ] Added [type annotations](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#type-hints) to new arguments/methods/functions.
- [ ] Added an entry in the latest `doc/source/whatsnew/vX.X.X.rst` file if fixing a bug or adding a new feature.

This will not be a PR for code contribution, but for translating documentation.
I would like to multilingualize pandas documentation by translating the pot files using a translation service called Crowdin.

According to @steppi, Crowdin will allow Scientific Python community to have a free enterprise account to serve as an umbrella account for managing translations of scientific Python projects.

By the way, I created these pot files using `sphinx-intl`, like https://github.com/sphinx-doc/sphinx-doc-translations .

I have opened an issue for discussion #56301 . Thanks for the PR so far, but as mentioned this topic needs more discussion before proceeding with a PR so closing so the discussion can happen in the opened issue first