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)

• #13835
• #13642
• #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)