Werk #15484: Fix encoding of special characters in "Move to other folder"

Component	Setup
Title	Fix encoding of special characters in "Move to other folder"
Date	May 2, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b7 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p28 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Special characters were wrongly displayed in the "Move to other folder" dropdown. E.g. "&" as "&".

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