display from_name on messages interface
display from_name on messages interface

test plan:
 - create a course with teacher and student
 - set student's announcement notifications to asap
 - create an announcement as a teacher
 - view the students messages, see that "From Name" is displayed

Change-Id: I1d57a7df7f83806c8e7510c6a2fc692dabef7050
Reviewed-on: https://gerrit.instructure.com/15045
Reviewed-by: Mark Ericksen <776ab05fc6b68e82d2b2c63873bf56edde131809@instructure.com>
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Marc LeGendre <d33c80bc45d65303e33ca83108a9952b745af9ef@instructure.com>

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