CKeditor-4, how to disable Font-Symbol? - utf-8

Question

My online CMS (that now is using CKEditor v4.2.2) not supports <font face="Symbol">, so online edit tool must preserve the "purity" of the UTF-8 of the online editions.
The problem arises when a user copy/paste from a external text to the CKeditor box,
<p><font face="Symbol">• </font>blabla
<font face="Symbol">S</font> blabla;</p>
Can CKEditor transform these <font face="Symbol"> into "free UTF-8"? That is, can CKEditor save
<p>• blabla Σ blabla;</p>
There are some configuration to enforce only UTF8 characters, without font-symbol?
EDITED: my configurations for test contextualization,
CKEDITOR.on( 'instanceCreated', function( event ) { // contenteditable
var editor = event.editor;
// ...
editor.on( 'configLoaded', function() {
editor.config.skin = '...';
// ...
});
});

Answer 1

First of all, if you want to solve this, you need to find a dictionary of these characters which will allow you to translate original characters to their UTF-8 representation.
To apply this transformation to all font elements use the dataProcessor. The dataFilter is applied to all data loaded or inserted into editor.
editor.dataProcessor.dataFilter.addRules( {
elements: {
font: function( el ) {
// el will be an instance of CKEDITOR.htmlParser.element
// el.children[ 0 ] will be an instance of CKEDITOR.htmlParser.text
// You'll need to read a value of that text, replace
// all characters with their UTF-8 representatives
// and return:
return new CKEDITOR.htmlParser.text( text );
// That will replace font tags with returned text nodes.
}
}
} );
Here you can find more complex exampled of dataProcessor usage: http://ckeditor.com/forums/CKEditor/Create-new-dom-elements-using-dataProcessor.htmlFilter