* Add DateDisplay to ObsCard and make first pass at translation strings
* Add failing tests (due to lack of localization) for timeless dates
* WIP: trying to ensure i18next gets initialized before tests run
The remaining test failures might be legit. This probably breaks the actual
app, though.
* Got the rest of the tests working
* Updated tests to assume UTC
* Updated README to advise against using `npx jest` so test runs always have
the env vars we specify in our `npm test` script
* Moved i18next initialization to an explicitly-named file
* Use i18next init function in app
* Fixed up remaining tests
* Added test for non-English localization of date format
* Cleanup
* Made DateDisplay explicitly handle strings not Dates
* Restore skipped localization tests for MyObservations
* Remove duplicative tests from DateDisplay unit test
* Added note to the README about initializing i18next
* Updated change to DateDisplay in main
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Co-authored-by: Ken-ichi Ueda <kenichi.ueda@gmail.com>
