Why I can't pass variable in daterangepicker?

Why I can't pass variable in daterangepicker?

Hello!
I have daterangepicker on my website: 
  
    
   

    2. 
   
  2.  $('#first_range').daterangepicker({
    3. 
   
  3.  startDate: moment(Elastic.periods[".second"].range["Purchase Date/Time"].gte, "YYYY-MM-DD"),
    4. 
   
  4.  endDate: moment(Elastic.periods[".second"].range["Purchase Date/Time"].lte, "YYYY-MM-DD"),
    5. 
   
  5.  ranges: rang,
    6. 
   
  6.  "locale": datelink
    7. 
   
  7.  }, cb1);
    8. 
   

    9. 
   
  9.  cb1(start, end);
    10. 
  
I'm trying to translate this datepicker to other languages. Due to this I created json files with translations(rang and datelink).
Doing this way causes error:
   
    
    
  1. jQuery.Deferred exception: rang is not defined ReferenceError: rang is not defined
    2. 
   
Rang and datelink are links to json files with languages and they are defined.
Is it impossible to pass variable into datepicker or I have errors in my code?