Custom Color List could not use custom color names

[cactus20100]

Steps to reproduce

1. add plugin "color button" to CKEditor with Office 2013 theme
2. Create a form like this :

<form style="margin-left: 80px;">
        <textarea name="editor1" id="editor1" rows="10" cols="80">
        </textarea>
        <script>
            var config = {
                language : 'en',
                height : '500',
                width : '600',
                colorButton_colors : 'Green1/3A9D23'
            }
            CKEDITOR.replace('editor1', config);
        </script>
</form>

3. Pass you mouse on the color of the color selector

Expected result

The color is named : Green1

Actual result

The color is named : 3A9D23

Other details (browser, OS, CKEditor version, installed plugins)

tested on IE11 (11.0.9600) and Firefox 47, on Windows 7 plugin color button : office 2013 theme tested on version 4.5.6 too.

[Jakub Ś]

This ticket can be considered as a dupliate of a larger one: #11679.

@cactus20100 I have added your comments there.