Minor enhancements to the Snippets Builder

[hhkaos]

I just noticed two things that could be improved:

• Add multi-line support in the description field
• Submit proposal button include duplicate info

Multi-line-support

This is not encoding properly the field:

It should be:

"A JavaScript only snippet": {
  "prefix": "myConsoleLog",
  "scope": "javascript, css",
  "body": [
    "console.log("Hello Map");",
  ],
  "description": "Console log \"Hello Map\".\nThis is a multiline description"
}

Submit proposal button

Since the last PR, it's including some info that is redundant:

[BochaberiDaisy]

@hhkaos, please assign me this issue.

[hhkaos]

sorry @BochaberiDaisy ! I missed this message!

[BochaberiDaisy]

No problem!