Make the API rate limit wording clearer.

[iamdharmesh]

Description of the Change

As reported in #362, the wording for the remaining requests is currently unclear, which may confuse users. We are currently displaying "16 of 17", which could cause users to misinterpret whether 16 represents the remaining requests or those already used. This PR makes minor wording updates to clarify the limits by changing it to "16 of 17 requests remaining". Additionally, PR makes an update to display the reset time in the site's timezone instead of UTC.

Closes #362

How to test the Change

1. Check the dashboard widget "Autopost for X — Rate Monitor" and verify that it reflects the wording correctly.
2. Create a new post or edit an existing post and verify that the limit wording is updated in the "Autopost for X" sidebar panel.

Changelog Entry

Changed - Made the API rate limit wording clearer.

Credits

Props @jeckman @iamdharmesh

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.