Werk #3659: Fixed GUI exceptions for users having special characters in ther user names

Component	User interface
Title	Fixed GUI exceptions for users having special characters in ther user names
Date	Jul 1, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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