i18n: fix missing translation on rubric save dialog
i18n: fix missing translation on rubric save dialog

fixes CNVS-19578

test plan:
- go to a course and create an assignment, with points possible
- add a rubric to the assignment
- mark the rubric for grading and have the rubric points add up to
  a different total than the assignment points possible
- save the rubric
- a dialog should pop up, asking if you want to change the assignment
  points possible or leave them different
- the dialog buttons "Change" and "Leave Different" should show up and
  work properly

Change-Id: Iebff1e7fd4793d259d1bf464bf4962fb9ced044d
Reviewed-on: https://gerrit.instructure.com/51144
Tested-by: Jenkins
Reviewed-by: Benjamin Porter <fdd60f2e3d506934848b3d0fff79c55f544a2d47@instructure.com>
QA-Review: Adam Stone <a0b2b61e2edcf99aa16080c2254a6ae6923d1fac@instructure.com>
Product-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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