With relative times, tooltip shows in browser language instead of document language

[JasonBarnabe]

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When using relative times, times older than a month are show absolutely, localized using the document's language (good!); however, the title is localized using the browser language (bad!). This should consistently use the document language.

https://github.com/github/time-elements/blob/4414cbacdb1e0cf95b7e99960897bb0c55736323/src/extended-time-element.ts#L64

[Wulfheart]

@JasonBarnabe did you open a PR?

[keithamus]

In v3.2.0 they both now use the same way to determine the local; looking for the closest element with a lang attribute. So I believe this fixes the issue. Let me know if you run into any other issues.