refactor: Removed single quotation marks on -knapp strings

[Ildest]

Description

Removed single quotation marks around
-knapp, for example ´Lagre´-knapp.

Checked for similar strings with double quotation marks, but found none.

Commented on strigns not changed - for example expression strings. Please advice.

Related Issue(s)

• Minor refactoring: Remove quotation marks around "legg til" in "legg til"-button #13684

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 94.57%. Comparing base (b8d6903) to head (c68da12).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13791   +/-   ##
=======================================
  Coverage   94.57%   94.57%           
=======================================
  Files        1624     1624           
  Lines       21817    21817           
  Branches     2572     2572           
=======================================
  Hits        20634    20634           
  Misses        940      940           
  Partials      243      243           

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[Jondyr]

Nice 👍