feat(administration): use html editor for message

[mirekys]

Description

This PR uses Sanitized HTML WYSIWYG editor instead of raw text input for banner message content to make banner administration more user friendly.

Checklist

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[ntarocco]

Thanks for the change, it would be nice to add a test with HTML ☺️

[mirekys]

I agree that's good to have, I added one :)