Fix KNX config flow translations and add data descriptions

[farmio]

Proposed change

Adds data descriptions for all fields (sometimes instead of step description to avoid redundancy).
Fix or clarify some descriptions.
Fixes wrong key in "knxkeys_tunnel_select" step.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[home-assistant]

Hey there @Julius2342, @marvin-w, mind taking a look at this pull request as it has been labeled with an integration (knx) you are listed as a code owner for? Thanks!

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[elupus]

LGTM

[farmio]

Thanks for the quick review! 👍