Newlines in description break the BP configuration

[sciolto]

Describe the bug

The frontend allows to add a description of a business process, with a multiline textarea field. Adding a new line actually breaks the configuration

To Reproduce

1. Create a BP
2. Fill the description field with at least 1 new line
3. Save the configuration
4. A error message appears

Expected behavior

The business process configuration is supposed to be written correctly, but is corrupt.

Screenshots

If applicable, add screenshots to help explain your problem.

Your Environment

Include as many relevant details about the environment you experienced the problem in

• Icinga Web 2 version and modules (System - About): 2.8.5 (icingaweb2-module-businessprocess 2.3.0 )
• Web browser used: Chrome
• Icinga 2 version used (icinga2 --version): 2.11.9
• PHP version used (php --version): 7.3
• Server operating system and version: CentOS 7.9