Improve i18n

[quiple]

• [x] Uses react-intl for datetime format.
  • [x] Replaces formatDate() with react-intl.
• [x] Replaces useCountryNames() with react-intl.
• [x] Replaces useLanguageNames() with react-intl.
• [x] Uses react-intl for number format.
  • [x] Replaces formatLongNumber() with react-intl.
• [x] Localizes formatShortTime().

[vercel[bot]]

@quiple is attempting to deploy a commit to the umami-software Team on Vercel.

A member of the Team first needs to authorize it.

[vercel[bot]]

Deployment failed with the following error:

The provided GitHub repository does not contain the requested branch or commit reference. Please ensure the repository is not empty.