Modifies the translation keys for course statistics
Modifies the translation keys for course statistics

fixes CNVS-15576

Test Plan:
  - Transifex should not fail on importing.

Change-Id: I70a9b453b1209389888e347e552ac9843c9acb40
Reviewed-on: https://gerrit.instructure.com/41200
Reviewed-by: Ryan Shaw <ea3cd978650417470535f3a4725b6b5042a6ab59@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
QA-Review: Clare Strong <40d6bb3ed7fef516c73274131d5a837c16de74fd@instructure.com>
Product-Review: Clay Diffrient <9dff2e5c98626d20d2848250c411e8009465bb87@instructure.com>

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