add staff to dropdown

client/coral-admin/src/containers/Community/Table.js

@@ -65,6 +65,7 @@ class Table extends Component {
                   label={lang.t('community.role')}
                   onChange={role => this.onRoleChange(row.id, role)}>
                   <Option value={''}>.</Option>
+                  <Option value={'STAFF'}>{lang.t('community.staff')}</Option>
                   <Option value={'MODERATOR'}>{lang.t('community.moderator')}</Option>
                   <Option value={'ADMIN'}>{lang.t('community.admin')}</Option>
                 </SelectField>

models/user.js

@@ -5,7 +5,8 @@ const uuid = require('uuid');
 // USER_ROLES is the array of roles that is permissible as a user role.
 const USER_ROLES = [
   'ADMIN',
-  'MODERATOR'
+  'MODERATOR',
+  'STAFF'
 ];
 
 // USER_STATUS is the list of statuses that are permitted for the user status.