SectorNordAG: Fixed format of file content in AdminPackageManager's ViewDiff mask

[ZTrotter]

Proposed change

After manually adjusting a file in an installed package and viewing the differences using AdminPackageManager's ViewDiff, line breaks aren't displayed, making it challenging to read. Furthermore, special UTF-8 characters like "ß" and "ü" aren't rendered correctly, due to the absence of an appropriate encoder. I suggest implementing line breaks for better readability and incorporating an encoder to correctly display special UTF-8 characters.

Type of change

🐞 bug 🐞

Additional information

Steps to reproduce

• Install a package over the PackageManager
• Navigate to package's source code and make and save a few changes (e.g with Command Shell)
• Go to AdminPackageManager
• Select changed package, then click on "View Changes".
• Changes will be displayed without line breaks or correctly encoded characters

Checklist

• The code change is tested and works locally.(❗)
• There is no commented out code in this PR.(❕)
• You improved or added new unit tests.(❕)
• Local ZnunyCodePolicy passed.(❕)
• Local UnitTests / Selenium passed.(❕)
• GitHub workflow CI (UnitTests / Selenium) passed.(❗)