capitalize words when editing a module

fixes CNVS-13179

As a teacher or admin
Given you have a module
And are on the modules page
Edit a module
Then you should see 'Lock module until a given date' is capitalized
And you should see 'Students must move through ...' is capitalized

Change-Id: Icfab7c67418baa65dd0b8b4b20fb28bc5fb8b3a4
Reviewed-on: https://gerrit.instructure.com/35246
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Product-Review: Hilary Scharton <hilary@instructure.com>
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>