message: fix typo in notification setting radio button text
diff: @@ -72,7 +72,7 @@ export default class NotificationSettings extends React.Component<{}, IState> {
  </div>
  <div className='second-set'>
  {this.renderRadioButtons('upper-right', 'Top Right')}
  - {this.renderRadioButtons('lower-right', 'Bottom Left')}
  + {this.renderRadioButtons('lower-right', 'Bottom Right')}
  </div>
  </div>
  </form>
  