Support QWERTZ keyboards in Confluence

Issue Summary

• Currently Confluence Cloud is only fully compatible with QWERTY keyboards.
• Other keyboard layouts work, but certain keyboard shortcuts, specifically those that use "Alt" combinations do not work.

Steps to Reproduce

• In a Confluence page in edit, any shortcuts that uses "Alt" will not work on a QWERTZ keyboard as the rest of the keys are disabled when "Alt" is hit.
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• This is unlike the QWERTY keyboard.
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• As a result of this, the following shortcuts are unusable.
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Suggestion

• Option to have other shortcut options like the one in Confluence Server, or have the shortcut options modifiable.
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