Symptoms

after upgrading to 4.6.9 "Umlaute" aren't rendered correctly. Take a look at the title bar of the sub view (Error Umlaute) and how it looks like on 4.6.7 (Umlaute before 4.6.9).
Please see attachments.
 

Diagnoses

The issue is reproducible by creating a subview with umlaute characters.
 

Resolution

There is a coldfix for this issue.