text: Title: Error after loading a JS file
  Body: Hello,
  
  I have created a folder called "1" in _/var/globaleaks/scripts_ and I have uploaded the file _custom_script.js_ (example I have seen in the forum from _https://github.com/AjuntamentdeBarcelona/bustia-etica-bcn/tree/master/theme_ -changing GLClient by GL-).
  
  I restart application with _service globaleaks restart_
  
  But I dont see changes in home page and the console shows an error like this:
  
  **Refused to execute script from 'http://127.0.0.1:8082/script' because its MIME type ('application/json') is not executable, and strict MIME type checking is enabled.**
  
  I am using a Laptop with Debian 11 and the last version of Globaleaks (4.10.18).
  
  Could you help me, please?
  
  Thanks
  