[iOS][Feature 52]Add Comment Page change Save and Cancel should be dark font indicating the user can select

Feature 52: Add Comment Page change Save and Cancel should be dark font indicating the user can select

- Trello: https://trello.com/c/VZ9iwUJE/79-6-33-feature-plus-icon-in-bottom-right-to-link-to-how-i-feel
- Test Case (User Story 3): https://docs.google.com/spreadsheets/d/1k-SLp2G9OQlW-h9w9bkLeQe8c1V6zcYMPhGF08GfvR8/edit#gid=866540701