Checkmk Werk 12533: Fix naming of entries in sorting section of views

ID: 12533 Title: Fix naming of entries in sorting section of views Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 If you created or edited a view, some entries in the "Sorting" section where shown as e.g. "<bound method PainterAlias.title of <cmk.gui.plugins.views.painters.PainterAlias object at 0x7fb79a752ca0>>" instead of "Host Alias".