Converts settings/page.tsx, SourceConfigForm, RssFeedListForm and
EmailAlertConfigForm from hardcoded German strings to
useTranslations('tenderRadar'). Interval bound and RSS-feed removal
validation/error messages use next-intl interpolation ({min}/{max},
{label}). Updates the three affected settings component tests with a
next-intl useTranslations mock mirroring the marketplace test convention.
The entire tender-radar module UI (results, filters, saved searches,
detail, coverage, settings, RSS/email forms) now honors the selected
locale (CONFIG-03, D-10) with no language switcher added (D-11).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
schalli
849aa9b0a9