Add missing violation snippet for email at path /account/register

[cramytech]

1. Why is this change necessary?

translation for error.VIOLATION::INVALID_FORMAT_ERROR is missing.

2. What does this change do, exactly?

add translation in the en-GB and de-DE snippets.

3. Describe each step to reproduce the issue or behaviour.

enter x@x as email at path /account/register

4. Please link to the relevant issues (if any).

5. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfil them.

[CLAassistant]

All committers have signed the CLA.

[github-actions]

	Warnings
⚠️	The Pull Request doesn't contain any changelog file

[shopware-github-importer]

Hello,

thank you for creating this pull request.
I have opened an issue on our Issue Tracker for you. See the issue link: https://issues.shopware.com/issues/NEXT-36145

Please use this issue to track the state of your pull request.

[mstegmeyer]

Hey, thank you for you contribution and congratulations to your first PR. Great to meet you at the Hackathon and I hope, you had fun at the SCD as well. 💙🎉

[wannevancamp]

@mstegmeyer , I saw this PR passing. We had a similar same issue. I don't think this solution is correct. This error can be thrown in different places and is not immediately related to email validation.

[mstegmeyer]

@wannevancamp you're right, email should probably just be input. I will fix it quickly 🙈