TASKMAN-28: Change the name of homepage from 'TaskManager Home' to 'Task Manager'

This is not good. 

You don't need to manually call TaskManagerTranslations, since it's scope is 'Wiki'. We manually call it when scope is 'on_demand'. 

Also reusing translations key that have a different purpose is a bad practice. Yes, it's probable that the Homepage title and the Panel label, could be the same, but this might not always be true. 
The solution is to add a key for Homepage title.