Adjust content expectation for admin/password_reset spec

PR #156 changed the I18n value for the text shown when an admin resets
their password

Author: aitbw

spec/features/admin/password_reset_spec.rb

@@ -68,7 +68,11 @@ def fill_in_email
           end
 
           click_button 'Reset password'
-          expect(page).to have_content 'You will receive an email with instructions on how to reset your password in a few minutes.'
+          expect(page).to have_content(
+            'If an account with that email address exists,
+            you will receive an email with instructions about
+            how to reset your password in a few minutes.'
+          )
         end
       end
     end