text: export const BEGIN_AJAX_CALL = 'BEGIN_AJAX_CALL';
  export const AJAX_CALL_ERROR = 'AJAX_CALL_ERROR';
  
  export const LOAD_COURSES_SUCCESS = 'LOAD_COURSES_SUCCESS';
  export const CREATE_COURSE_SUCCESS = 'CREATE_COURSE_SUCCESS';
  export const UPDATE_COURSE_SUCCESS = 'UPDATE_COURSE_SUCCESS';
  
  export const LOAD_AUTHORS_SUCCESS = 'LOAD_AUTHORS_SUCCESS';