Add pot files for translating pandas documentation

[kozo2]

• closes #xxxx (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations 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 .

[phofl]

You should open an issue for discussion first

[kozo2]

I have opened an issue for discussion #56301 .

[mroeschke]

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