Actions->Start Task: Various localization bugs

Steps to reproduce:
1. Open Actions->"Start Tasks" on the Events page

Actual Results:
There are several problems considering the localization of that modal:

• Wizard page titles wrong ("Select Task" instead of "Summary")

• Wizard page titles don't support localization at all

Expected Results:
Correctly strings should be used. Localization should be supported.

Workaround (if any):