chore(ModalHeader): enable dynamic aria-label value

[cf-remylenoir]

Purpose of PR

We want to prevent hardcoded strings so that our components are fully dynamic.

PR Checklist

• I have read the relevant readme.md file(s)
• All commits follow our Git commit message convention
• Tests are added/updated/not required
• Tests are passing
• Storybook stories are added/updated/not required
• Usage notes are added/updated/not required
• Has been tested based on Contentful's browser support
• Doesn't contain any sensitive information

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Name	Status	Preview	Updated (UTC)
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Latest commit: 73d03fd

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	112.2 KB (-0.01% 🔽)	2.3 s (-0.01% 🔽)	1.5 s (+16.57% 🔺)	3.7 s
Module	110.97 KB (+0.09% 🔺)	2.3 s (+0.09% 🔺)	1.7 s (0%)	3.9 s