[#880] Escape admin felter, så evt. HTML koder ikke renderes

[rasmusselsmark]

Relateret til #880

Escape felter i admin views, så evt. HTML koder ikke renderes, da dette kunne være et sikkerhedshul. Søgte efter alle sider hvor vi sætter link = '<a ...

Test med html koder og unicode:

[what-the-diff]

PR Summary

• Enhanced Security Across Several Admin Files
  The team added a specific command ('import statement') to several program parts that manage activities, invitations, participants, departments, and more. This command would import a special security functionality that prevents harmful inputs from causing issues in these parts of the program.

• Safe Display of Union Names
  To ensure safe interactions with the platform, the team made sure that the display of union names, within different sectors like activities, invites, and others, is done securely. This means that any potentially hazardous input in these fields is neutralized, providing a safer environment for users.

• Secured Activity and Participant Names
  Similar measures are put in place for displaying names related to activities and the participants involved in those activities. The system will now handle this securely, thus enhancing user safety.

• Added Safety Measures for Personal and Email Information
  Finally, the team has worked on ensuring even personal information like an individual's name and their family's email is displayed securely. As such, users can trust the system to responsibly handle their data while displaying it in various sections.