fix: add correct strings for new course update notifications

[saadyousafarbi]

INF-1244

Description

Add strings to course notification preference for new course update notification

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.53%. Comparing base (3467534) to head (e06183c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #990   +/-   ##
=======================================
  Coverage   56.53%   56.53%           
=======================================
  Files         118      118           
  Lines        2457     2457           
  Branches      654      654           
=======================================
  Hits         1389     1389           
  Misses        997      997           
  Partials       71       71           

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