Ændret tekst fra "Pris for medlemskab" til "Kontingent"

[anders160196]

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[what-the-diff]

PR Summary

• Updated Label for Membership Fee
  We have changed the label of the 'membership_price_in_dkk' field from "Pris for medlemskab" to "Kontingent" in two places where database updates are defined. This was done to make the terminology more accurate.

• Synchronized Term in the Model
  We have updated the label of the same field in the actual place where we defined characteristics of the 'union' entity in our project so it reflects the corrected label defined in the database updates. This ensures consistency in our codebase and makes it easier to understand and manage in future.