internationalize category names for graphs
internationalize category names for graphs

closes TALLY-281
flag=none

Test Plan
- Set up analytics.
- Enable page views. The easiest way is to do this in canvas console:
  `Setting.set("enable_page_views", "db")`

  Be sure to disable it afterwards.

- Start your rails server with LOLCALIZE=true.
- Visit all the different pages in a course.
- Navigate to the analytics page and verify that the category names
  in the "Activity By Category" graph are internationalized.
  `your_canvas/accounts/self/analytics/`

Change-Id: I3c7bef6e3691c36e33ed040486a20dc0712d5a4d
Reviewed-on: https://gerrit.instructure.com/c/analytics/+/222152
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Adrian Packel <9c6a39807293376f29cba17542b4cb1b663ecc4a@instructure.com>
Reviewed-by: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>
QA-Review: Gary Mei <4dff5ebcff9ed76793b70b9470ac64791a16ed11@instructure.com>
Product-Review: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>

instructure/analytics,instructure/analytics,instructure/analytics