title: Eclipse Luna : can't remove default encoding for javascript and json
body: <p>I'm trying to remove the default UTF-8 encoding of javascript / json files because I want to use the workspace default text encoding, but it doesn't seem to work with eclipse Luna.</p>
  
  <p><strong>1 -</strong> Default encoding set to UTF-8 for javascript files
  <img src="https://i.imgur.com/e0xbhXt.png" alt="default encoding is UTF-8"></p>
  
  <p><strong>2 -</strong> I remove the default encoding and click "update"
  <img src="https://i.imgur.com/E2SP4YR.png" alt="deleting default encoding"></p>
  
  <p><strong>3 -</strong> If I leave and go back to check javascript file encoding, it's back to UTF-8 (1st image).</p>
  
  <p>Am I missing something here ?</p>