v1.5.4

## What's Changed

* feat: System prompts now support a key to retrieve the current date and time.
* feat: Added an option for the user chat bubble.
* feat: Added a copy button to user messages.
* chore: Updated French translations by @hgourvest in https://github.com/n4ze3m/page-assist/pull/477
* chore: Updated Chinese translations by @Nriver in https://github.com/n4ze3m/page-assist/pull/478
* refactor: Added error handling and cleaned up code by @garyhuangdev in https://github.com/n4ze3m/page-assist/pull/482
* fix: Fixed the Model Nickname bug.

## Note for Firefox Users

As I mentioned in the [1.5.3 release](https://github.com/n4ze3m/page-assist/releases/tag/v1.5.3), the Firefox extension now requires a human review, which will delay the release or the availability of the latest updates. I will upload the latest version to the add-on store every week and hope they approve it quickly

## Note for Chrome Users

Somehow, version 1.5.3 has not yet been reviewed by the Chrome Web Store. So, in this case, I am including the CRX file of the latest release, which you can simply drag and drop into `chrome://extensions/`. This will automatically update Page Assist to the latest version without removing any data.

## New Contributors
* @hgourvest made their first contribution in https://github.com/n4ze3m/page-assist/pull/477
* @Nriver made their first contribution in https://github.com/n4ze3m/page-assist/pull/478
* @garyhuangdev made their first contribution in https://github.com/n4ze3m/page-assist/pull/482

**Full Changelog**: https://github.com/n4ze3m/page-assist/compare/v1.5.3...v1.5.4