Checkmk Werk 11650: Fix validation of input fields on different pages

ID: 11650 Title: Fix validation of input fields on different pages Component: Multisite Level: 1 Class: Bug fix Version: 2.0.0i2 On some pages in the mega menu "Customize", it was possible to enter invalid values in input fields like "Unique ID" or "Title". This pages now handle the validation correctly.