Remove use of multiple h1 heading elements on info modal

[MisRob]

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Complexity: Low

Summary

shared/views/InfoModal wraps heading texts provided via the header slot in <h1> heading elements. This results in incorrect semantic structure with multiple <h1> in the modal.

<h2> should be used for headers provided via the header slot, leaving the main modal title the only <h1>.

InfoModal is used from more locations in the app. One way to preview this is 'About licenses' modal in Settings > Storage > Request more space.

How to get there

• Login as user@a.com with password a
• Go to Settings > Storage > Request more space
• Click Open form
• Click on info button next to Who can use your content? (Note that button click is broken, fix here. Before the fix is released, temporarily modify code in InfoModal to make the modal visible.)

Acceptance criteria

• Manually test the correct markup structure in the modal
• There are no visual changes