Custom icons / Use Font awesome

Include Jodit and and the CDN Font Awesome

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="build/jodit.min.css">
<script src="build/jodit.min.js"></script>

Create input element

<textarea id="editor">Some text</textarea>

And define evnet getIcon

var editor = new Jodit('#editor', {
    events: {
        getIcon: function (name, control, clearName) {
            var code = name;

            // not all font awesome icons is matched to Jodit icons
            switch (clearName) {
                case 'redo':
                    code = 'rotate-right';
                break;
            }

            return '<i style="font-size:14px" class="fa fa-' + code + ' fa-xs"></i>';
        }
    }
});

For full replacing you can copy this code:

var editor = new Jodit('#editor', {
   events: {
       getIcon: function (name, control, clearName) {
           var code = clearName;

           switch (clearName) {
               case 'redo':
                   code = 'rotate-right';
                   break;
               case 'video':
                   code = 'video-camera';
                   break;
               case 'copyformat':
                   code = 'clone';
                   break;
               case 'about':
                   code = 'question';
                   break;
               case 'selectall':
                   code = 'legal';
                   break;
               case 'symbol':
                   return '<span style="text-align: center;font-size:14px;">Ω</span>';
               case 'hr':
                   code = 'minus';
                   break;
               case 'left':
               case 'right':
               case 'justify':
               case 'center':
                   code = 'align-' + name;
                   break;
               case 'brush':
                   code = 'tint';
                   break;
               case 'fontsize':
                   code = 'text-height';
                   break;
               case 'ul':
               case 'ol':
                   code = 'list-' + name;
                   break;
               case 'source':
                   code = 'code';
                   break;
           }

           return '<i style="font-size:14px" class="fa fa-' + code + ' fa-xs"></i>';
       }
   }
});

Result