i18n points possible display LMS-2201

@nedbat 

This is the ticket: https://edx-wiki.atlassian.net/browse/LMS-2201

This is a file you said in the XModule spreadsheet you i18n'ed but these strings got missed. Moreover, the solution I've tried to do here *doesn't work*. I'm hoping you can provide some advice on what the right way to go about this is (it may be as simple as "coffeescript needs to import ungettext").