Regions v3 regression, Intl polyfill

[ofreyssinet-ledger]

• [x] Put region settings back in the general settings UI.
• [x] Reimplement of "searchable" list in makeGenericSelectScreen.tsx, this was a regression of v3 as it was implemented in the .js version already.
• [x] Fix regression in components using the incorrect locale (things that were implemented in V2 but not in V3 components), used this PR as a base #1941.
• [x] Fix remaining incorrect uses of useLocale() when doing number/date formatting (instead, using localeSelector), see following point for explanation.
• [x] Rename useLocale() (in Locale.js) to useTranslationLocale() & document it to avoid confusions & uses in wrong context (it should be used only for handling translatable content, not for number & date formatting).
• [x] Ensure Intl polyfill (for Hermes) are imported and working for all selectable regions. (with a small patch to avoid this issue https://github.com/formatjs/formatjs/issues/3503)
• [ ] ⚠️ DX is bad because importing all locale data at each reload takes very long
• [ ] Need to revert this change in live-common https://github.com/LedgerHQ/ledger-live-common/commit/6b9efb53f793397d71010d3db6876867f327d7f4 as it prevents formatting of currency (it would work without this change thanks to the polyfill)

Type

Bug fix

Context

Parts of the app affected / Test plan