[openstreetmap/openstreetmap-website] Fix the build by adding Arpitan as UI language (PR #6288)

[Pablo Brasero]

The recent merge of https://github.com/openstreetmap/openstreetmap-website/commit/bae910cf844ede7c23d20c6b51e2f844be9b10dc broke the build. It added a new language: Franco-Provençal aka Arpitan (code `frp`), but didn't add it to the list at `config/ui_languages.yml`.

I know nothing about Franco-Provençal, and I'm new to this codebase. Judging from the current list of UI languages, I gather these rules apply:
1. Languages are listed with their native name: Eg: _español_, _italiano_.
2. Where Latin script applies, languages names are capitalised only if the rules of the language require it. Eg: _español_, _italiano_ vs _English_, _Deutsch_.

Therefore, and looking at [the relevant Wikipedia page](https://en.wikipedia.org/wiki/Franco-Proven%C3%A7al), I'm going with the name _arpetan_ as it appears to follow the rules above.

I'm aware that I might be completely wrong at several levels! Happy to learn if someone will correct me.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6288

-- Commit Summary --

  * Add Arpitan as UI language

-- File Changes --

    M config/ui_languages.yml (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6288.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6288.diff

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