Unordered list render is incorrect in RichTextInput

[nickwaelkens]

What you were expecting:
When adding an item to an unordered list in ra-input-rich-text the list items should be prefixed with a bullet (•).

What happened instead:
The list items are being prefixed with "2022".

Steps to reproduce:
As experienced on the demo page:

• Add an unordered list
• The newly created list item doesn't have a bullet but renders 2022 instead.

Other information:
This is what happens when I'm trying to add an item to an unordered list in the editor:

As stated in my previously created, kind of related issue (#2125): I'm guessing something went wrong when transforming the Quill theme to JSS? There's clearly a missing backslash to get the correct unicode character; \2022.

Environment

• React-admin version: 2.2.0
• React version: 16.4.2
• Browser: latest Chrome on OSX