message: Change panel headings to use translation
diff: </div>
  <div local-class='panel-wrapper'>
  <Panel local-class='sso-users-connected' as |panel|>
  - <panel.heading @title='SSO Users Connected' />
  + <panel.heading @title='{{t 'institutions.dashboard.users_connected_panel'}}' />
  <panel.body>
  {{this.institution.statSummary.ssoUsersConnected}}
  </panel.body>
  </Panel>
  <Panel as |panel|>
  - <panel.heading @title='Total Projects' />
  + <panel.heading @title='{{t 'institutions.dashboard.projects_panel'}}' />
  <panel.body>
  <p></p>
  </panel.body>
  </Panel>
  <Panel as |panel|>
  - <panel.heading @title='Departments' />
  + <panel.heading @title='{{t 'institutions.dashboard.departments_panel'}}' />
  <panel.body>
  <p></p>
  </panel.body>
  