Fix line-break issue in the navigation sidebar
Fix line-break issue in the navigation sidebar

A couple of possible titles with long words in them could get
inappropriately broken, in a way that ended up being kinda ugly. This
fixes that!

related to #1153
pr #1214

mitodl/open-discussions,mitodl/open-discussions,mitodl/open-discussions,mitodl/open-discussions,mitodl/open-discussions