fixes#10690
previously, notifications only considered user locale settings
when translating; they now consider the context as well.
test plan:
* create a course with a spanish or russian locale;
* enroll an english user in the course;
* verify that the enrollment email is sent in the course
locale and not the user locale.
Change-Id: Ib942f35dff770ec02aa4e39880a5234e318f26a9
Reviewed-on: https://gerrit.instructure.com/14103
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Jon Jensen <jon@instructure.com>
Zach Pendleton