remove Proc values from generated locale files
remove Proc values from generated locale files

fixes FOO-1614

Procs can't be serialized and they caused us issues recently in the
upgrade to Rails 6, now the generator will omit any phrase that has
a value of that type, instead of selectively omitting hard-coded phrases

TEST PLAN
---- ----

run "rake i18n:generate" and verify config/locales/generated/en.yml
does not have any Proc values, alternative diff the file before this
patch and after and verify they are identical

Change-Id: Icc8bfa32c2d667518727d732d689a8b2865be1bd
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/265444
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
QA-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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