Ensure timestamp tooltips respect locale

What does this MR do and why?

Ensure timestamp tooltips respect locale

This introduces a new localeDateFormat formatter: asDateTimeFull. That formatter is now utilized in rendering the datetime for the tooltips.

Fix minor typo in the docs

localDateFormat => localeDateFormat

Screenshots or screen recordings

Locale	Before	After
en-US
en-US with forced 24h	same as above
en-GB	same as above
fr
de
zh-CN

How to set up and validate locally

1. Hover any time stamp
2. Switch your GitLab language settings and/or the time format

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