Change added as a speaker email

[odkhang]

This PR references issue #138. In the submission.py change the existing email to the new version.

How has this been tested?

Checklist

• [ ] I have added tests to cover my changes.

Summary by Sourcery

This pull request updates the email template used to notify speakers about their proposal acceptance, enhancing the tone and clarity of the message.

• Enhancements:
  • Updated the email template for notifying speakers about their proposal acceptance, making the language more welcoming and informative.

[sourcery-ai[bot]]

🧙 Sourcery has finished reviewing your pull request!

---

Tips

- Trigger a new Sourcery review by commenting `@sourcery-ai review` on the pull request. - Continue your discussion with Sourcery by replying directly to review comments. - You can change your review settings at any time by accessing your [dashboard](https://app.sourcery.ai): - Enable or disable the Sourcery-generated pull request summary or reviewer's guide; - Change the review language; - You can always [contact us](mailto:support@sourcery.ai) if you have any questions or feedback.

[odkhang]

Hi @mariobehling, Please help me review this PR

[odkhang]

[mariobehling]

It looks like you are testing the wrong email. This email is for adding a co-speaker.