Convert Factur-X user messages to English

[baimard]

Motivation

• Convert remaining Factur‑X user-facing messages and PDF/XML fallback server error texts from French to English so the UI messaging is consistent.

Description

• Replaced French strings with English equivalents in src/js/pdf.js and src/js/modules/ajaxRequest.js, committed on branch codex/issue-529, and opened this draft PR targeting master.

Testing

• Ran node --check src/js/pdf.js and node --check src/js/modules/ajaxRequest.js, which passed, and git diff --check, which passed; npm run build failed due to an external network fetch of Google Fonts returning HTTP 403; npx eslint src/js/pdf.js src/js/modules/ajaxRequest.js could not run because the repository does not include an ESLint flat config file.

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep Factur-X XML translations wired up

For locales that already translate the old Factur-X XML messages, the new t() source strings here are absent from l10n/ while the catalogs still contain the previous French keys such as Fichier XML Factur-X généré et sauvegardé. and Erreur lors de la génération du XML : (verified with rg). Since Nextcloud translation lookup uses the source string as the key, XML generation success/failure messages now fall back to English for those users instead of their existing translations; please update the localization catalogs alongside the key change or otherwise preserve the old keys.

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