make rubric points translations more i18n friendly, refs CNVS-6456
make rubric points translations more i18n friendly, refs CNVS-6456

this reverts commit ddda9353877e69d55ee2a2b829f78fcc0bb95349 and adds
aria labels in a slightly different way. also change translation key to
avoid page errors due to placeholder mismatch

i18n wrapper wasn't a great fit here since it was combining two loosely
related strings into one, rather than keeping a coherent phrase/sentence
together. e.g. a translator quite understandably might see "*Points* pts",
think it's a typo and just do something like "*Puntos*"

test plan (same as ddda935):
 - go to assignment creation page
 - add a rubric
 - verify that "Points" is read via VoiceOver when the criterion points
   field is focused
 - verify that there is no text following the points input field

 - go to SpeedGrader™ with an assignment that has a rubric
 - verify that "Points" is read via VoiceOver for the criterion points
   field
 - verify that there is a label like "/5pts" following the input field

Change-Id: I152ce523307b5bcd40820694ac800429bbd81b7a
Reviewed-on: https://gerrit.instructure.com/25308
Reviewed-by: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Product-Review: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>
QA-Review: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>

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