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## Linked issue
Noted in
https://github.com/ankitects/anki/pull/5105#pullrequestreview-4861060987
## Summary
RTL languages are tracked in two separate places
(pylib/anki/lang.py:is_rtl and ts/lib/tslib/i18n/utils.ts:direction) but
they are out of sync.
## Steps to reproduce (before)
- Run with Uyghur set as language: `./run -l ug`.
- Open the Deck Options screen and notice the page's direction is
left-to-right.
## How to test (after)
Confirm the Deck Options screen is displayed right-to-left for Uyghur.
### Checklist (minimum)
- [x] I ran `./ninja check` or an equivalent relevant check locally.
- [x] I added or updated tests when the change is non-trivial or
behavior changed.
### Details
A better solution is to keep a single list in the backend or detects the
directionality of the locale name (see [example in
AnkiDroid](eb22e1e6ad/AnkiDroid/src/main/java/com/ichi2/anki/LanguageUtils.kt (L47))).
Both requires moving anki.lang.langs to the backend, which I don't think
is worth the effort.
## UI evidence
### Before
<img width="1406" height="654" alt="image"
src="https://github.com/user-attachments/assets/e9e8aa75-e6b1-4a27-85d5-cfda16c16314"
/>
### After
<img width="1425" height="777" alt="image"
src="https://github.com/user-attachments/assets/48994c54-8209-4c6b-821e-c734c85e96e2"
/>
## Scope
- [x] This PR is focused on one change (no unrelated edits).