refactor: changed Tom knapp + help text

[Ildest]

Description

Changed Tom knapp to Egendefinert knapp, and amended the help text. Please see information in related issues/sub-issues about how Anniken and I think we should proceed with improving the user experience of the button components.

Related Issue(s)

• Change component name "Tom knapp" to "Egendefinert knapp" #13835
• As a user, I want to see Knappegruppe with the other buttons #13642
• Component panel: Can we gather the buttons into their own accordion tab? #13358

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

Documentation

• User documentation is updated with a separate linked PR in altinn-studio-docs. (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.09%. Comparing base (e371e77) to head (6596192).
Report is 32 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13895   +/-   ##
=======================================
  Coverage   95.09%   95.09%           
=======================================
  Files        1657     1657           
  Lines       22097    22097           
  Branches     2601     2601           
=======================================
  Hits        21014    21014           
  Misses        835      835           
  Partials      248      248           

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[nkylstad]

👍