Hi there. Your itinerary seems entirely reasonable. Just a couple quick comments if I may:

First, in both Paris and Munich, virtually everyone remotely involved in the tourist industry will be able to speak at least some English. Don't even worry about it.

Second, there are likely to be a handful of public holidays during that stretch, especially in Munich and Paris (for instance, May Day). Just check that this doesn't clash with your trip too badly, otherwise you may find that certain attractions are closed and that transport will be running on a reduced schedule.