Unify learner and student text views

[IvyJL]

As a teacher, I want to be able to export a vocabulary list of the unknown words in a text.

Right now, only learners see lists of glosses of unknown words in the reading environment and can export them. Those unknown words are based on the learner's personal vocab list and familiarity. As a teacher, I want to export a list of glosses for unknown words based on any vocab list.

Students may also want to do this, so in general I wonder if we can think about reworking these user categories.

[jaguillette]

Initial thoughts on available actions:

• edit text
• disambiguate vocabulary

Information you can view:

• gauge charts
• token info
• gloss lists

The learner view components also need a way of changing which vocabulary list is being compared against.

We also need to clarify who can do what to texts. Owners should always be able to edit things they've added, but what about giving other people edit access?

[IvyJL]

Closing this as it will get rolled into the bigger project of #495 unifying teacher and learner views.