Check_MK Werk 1800: Fixed umlauts and HTML tags in exception texts

ID: 1800 Title: Fixed umlauts and HTML tags in exception texts Component: Multisite Level: 1 Class: Bug Fix Version: 1.2.7i1 Previous versions allowed HTML codes to be used in texts of exceptions to give the error messages some kind of markup. This was removed to prevent XSS attacks. Now we changed the code to only allow special markup tags like <tt>, <b>, <i>, <br>. So if you saw these tags in error messages in previous version, they should be fixed now. Additionally, when you used the Web GUI localized, for example in German language, you might have had problems with umlauts in error messages. This has been fixed and cleaned up.