add i18n number formatting to grading scheme selector
add i18n number formatting to grading scheme selector

fixes: CNVS-34064

Test Plan:
1. As course administrator, navigate to course settings
2. Click on Grading Scheme > view grading scheme
  - Click on 'Select Another Scheme'
  - Select a scheme
  - Observe that selected scheme is shown with i18n'ed numbers

Change-Id: Ibd0f8aea482534ad671d631e37d45c870b357d4e
Reviewed-on: https://gerrit.instructure.com/101942
Tested-by: Jenkins
Reviewed-by: Jeremy Neander <20252aad5efdc666f083d82ab63ed0f9f72a043e@instructure.com>
Reviewed-by: Sheldon Leibole <0df5b32fdda8d9292b2816c3a2104c21861536ec@siimpl.io>
Reviewed-by: Shahbaz Javeed <6692d7be3fa215e5483a121d6fb314def6049877@instructure.com>
QA-Review: Anju Reddy <851202533fb1f0b615e4547ba226c76996d060dd@instructure.com>
Product-Review: Keith T. Garner <a1a80143a840c140f31c3495ebbd9ec906e09fed@instructure.com>

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