text: Title: Configurable Spacing After ":" in JSON via "Customize JSON Output" addon
  Body: ### Describe the problem
  
  My files don't have a space, but Weblate reformats the entire file by adding one.
  
  ```diff
  -"in_1_mile":"In einer Meile",
  -"in_1_5_miles":"In anderthalb Meilen",
  -"in_2_miles":"In zwei Meilen",
  -"unknown_camera":"Blitzer voraus"
  +"in_1_mile": "Za jednu míli",
  +"in_1_5_miles": "Za jednu a půl míle",
  +"in_2_miles": "Za dvě míle",
  +"unknown_camera": "Radar před vámi"
  ```
  
  ### Describe the solution you would like
  
  Could we add an option to the "Customize JSON output" addon to control spacing after the ":"? 
  
  ### Describe alternatives you have considered
  
  _No response_
  
  ### Screenshots
  
  _No response_
  
  ### Additional context
  
  _No response_