Werk #18087: User messages: Show correct text in email and enable multiline support

Component	User interface
Title	User messages: Show correct text in email and enable multiline support
Date	Aug 26, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p11 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The text of user messages send via email was broken.

Furthermore, multiline text is now shown as such, also in other messaging options.

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