Checkmk Werk 13924: Dashboard element 'Alert statistics': Apply context filters and rename

ID: 13924 Title: Dashboard element 'Alert statistics': Apply context filters and rename Component: Multisite Level: 1 Class: Bug fix Version: 2.2.0i1 The 'Alert statistics' dashboard element is renamed to 'Alert overview' for a higher naming consistency among comparable dashboard elements. Also the context filters for this element are fixed and now applicable.