Werk #18379: "Send user message" is now able to handle users with special characters

Component	Setup
Title	"Send user message" is now able to handle users with special characters
Date	Apr 15, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0b5 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The "Send user message" page crashed if any user account had some dots/dashes/underscores.

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