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`navigator.language` can be `undefined` in headless browsers (e.g. Playwright Firefox), causing `RangeError: invalid language tag: "undefined"` in `Intl.DateTimeFormat` within the `relative-time` web component. Also adds an e2e test that verifies `relative-time` renders correctly and a shared `assertNoJsError` helper. Bug is als present in https://github.com/github/relative-time-element but (incorrectly) masked there. Fixes: https://github.com/go-gitea/gitea/issues/25324 --------- Co-authored-by: Claude (Opus 4.6) <noreply@anthropic.com> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>