Improvement to holidays config form

[bors-ltd]

The problem

I recently set up the holidays integration for my country (France), and was left puzzled at the second step:

As a Frenchman living in mainland France, I have no idea what those abbreviations mean. The second issue is that It wasn't obvious to me that step was optional.

I've started solving this issue by contributing to the holidays project itself, both to their documentation and to the source code: vacanza/holidays#2162

Now I'd like HA to make use of that subdivisions_aliases when available to present a more user-friendly list of options. The holidays project follows ISO 3166-2, which is great for machines, not so much for humans.

I've pinpointed the code in core, but before spending more time, I'd like to know if you'd be be interested in such a contribution.

On a side note, it's not just France. I've checked other countries have defined plain-text aliases in holidays, like Italy or New Zealand, so it would benefit to users of those countries as well.

What version of Home Assistant Core has the issue?

core-2024.12.4

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

holiday

Link to integration documentation on our website

https://www.home-assistant.io/integrations/holiday

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant]

Hey there @jrieger, @gjohansson-ST, mind taking a look at this issue as it has been labeled with an integration (holiday) you are listed as a code owner for? Thanks!

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holiday documentation
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[gjohansson-ST]

Yes, I think that wasn't a thing when holiday was made and workday which is built on the same lib has the same issue I guess.

A contribution would be welcome 👍 , be sure to use the regular subdivisions for values and that we use subdivisions_aliases only to provide labels (when available).

I will make a contribution myself to workday with this, and then I hope to see a PR from you closing this issue with a PR for holiday 🚀

[gjohansson-ST]

I have made a PR now for workday. Feel free to get inspired (linked it to this issue)