Replace /server/dictionaries with /server/translations: install/uninstall language packs from upstream translator repo

[r1ckstardev]

This issue tracks Phase 1 of the BTCPay Server translations revamp roadmap.

Goal

Replace the current /server/dictionaries raw CRUD surface with a /server/translations page that:

• Lists installed languages with maintainer attribution (handle + GitHub link), native name, last-updated date.
• Lists languages available to install from btcpayserver-translator upstream.
• One-click install and update from upstream.
• No popup or multi-step modal.

Data source

Single manifest.json at the root of btcpayserver-translator, regenerated by CI on every merge to main:

{
  "languages": [
    { "code": "fr",
      "bcp47": "fr-FR",
      "name": "French",
      "native": "Francais",
      "file": "translations/french.json",
      "sha": "...",
      "maintainer": "teamssUTXO|https://github.com/teamssUTXO",
      "updated": "2026-04-12T10:30:00Z" }
  ],
  "_redirect": null
}

The server fetches manifest.json once per hour (cached). Individual language files are fetched only on user-initiated install. The bcp47 field is what the future per-user dropdown will match against Accept-Language.

Backwards compatibility

For BTCPay versions hardcoded to fetch translations/<lang>.json directly (pre-manifest), the static files at the old URLs remain in place. New versions read from manifest.json and follow its entries.

The manifest top-level _redirect field is reserved for a future move to a standalone translations repo - clients follow it without coordinated server-side changes. The default manifest URL inside BTCPay Server source is updated on each release so the redirect is a fallback, not the primary path.

Dependencies

This page depends on these btcpayserver-translator PRs landing first:

• #47 (1amKhush): core language-pack validation. Catches malformed language packs at install time.
• #49 (teamssUTXO): unit tests + CI workflow. Foundation for the manifest.json regeneration. Per its description, merges after Automating bundling of JS/CSS files #47.

Both bundled into Phase 1 of the roadmap so the install path has working validation + the manifest comes online with CI behind it.

Target

Phase 1 target completion: 2026-05-04 (2 weeks from 2026-04-23).

[coderabbitai]

🔗 Related PRs

#6904 - Refactor : Added missing translation dynamic strings [merged]
#6943 - feat : add functionality to download language pack [merged]
#7086 - chore: add pre-release check for language packs list [merged]
#7185 - feat: added ability to update translations [merged]
#7315 - Fix double translation of already localized view content [merged]

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[mp21-org]

Currently Downloads of i.e. the spanish and german language pack leads to a 404 error - is this related?
see: https://t.me/btcpayserver/97503

cc @rockstardev

[teamssUTXO]

PR Translator #54 merged. I'm going to tackle this.

Hey @petzsch , it seems that this is not related.

[NicolasDorier]

@petzsch I've fixed it btcpayserver/btcpayserver-translator@2522bc9