translate modules SR only text
translate modules SR only text

fixes LS-3536
flag=none

test plan:
  - log in as a teacher
  - set your profile locale to anything other than english
  - navigate to /courses/:id/modules
  - enable a screen reader and navigate to the button to create a module
    - the text should be translated for "Add"

qa risk: low

Change-Id: I407ed42dd991411cc73d6100129d9202d38981a7
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/303114
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Jackson Howe <318c10a818c1b1f2ec50cdcb1827b2c6c5ebd7dc@instructure.com>
QA-Review: Jackson Howe <318c10a818c1b1f2ec50cdcb1827b2c6c5ebd7dc@instructure.com>
Product-Review: Davis Hyer <60fbffed049dcae9186e63e354cbc0b825bf5523@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms