Added cursor for the editor. Fix issue #4913

## Steps to reproduce the issue

Create a new article. Click in the tinymce content editor

## Expected result

Cursor appears eg |

## Actual result

Nothing appears so you dont know if you are able to type anything

## System information (as much as possible)

Google Chrome on OSX Version 38.0.2125.104
I can not replicate this on firefox on safari

## Additional comments