DEV: Correct typos and spelling mistakes (#12812)

Over the years we accrued many spelling mistakes in the code base. 

This PR attempts to fix spelling mistakes and typos in all areas of the code that are extremely safe to change 

- comments
- test descriptions
- other low risk areas

spec/components/unread_spec.rb

@@ -26,7 +26,7 @@ describe Unread do
   end
 
   describe 'staff counts' do
-    it 'shoule correctly return based on staff post number' do
+    it 'should correctly return based on staff post number' do
 
       user.admin = true