Proper i18n date/time handling (#17858)

* install date-fns-tz

* add date locale hook

* refactor formatUnixTimestampToDateTime

Use date-fns style instead of using strftime. This requires changing the i18n keys to the way date-fns represents dates (eg: "MMM d, h:mm:ss aaa"  instead of "%b %-d, %H:%M"

* refactor calendar to use new hook

* fix useFormattedTimestamp to use new formatUnixTimestampToDateTime date_format

* change i18n keys to new format

* fix timeline

* fix review

* fix explore

* fix metrics

* fix notifications

* fix face library

* clean up

web/package.json

@@ -44,6 +44,7 @@
     "cmdk": "^1.0.0",
     "copy-to-clipboard": "^3.3.3",
     "date-fns": "^3.6.0",
+    "date-fns-tz": "^3.2.0",
     "embla-carousel-react": "^8.2.0",
     "framer-motion": "^11.5.4",
     "hls.js": "^1.5.20",