https://books.publisso.de/modules/custom/publisso_gold/js/ckeditor/config.js?v=1.x

1CKEDITOR.editorConfig = function( config ) {
2	config.toolbarGroups = [
3		{ name: 'document', groups: [ 'mode', 'document', 'doctools' ] },
4		{ name: 'clipboard', groups: [ 'clipboard', 'undo' ] },
5		{ name: 'editing', groups: [ 'find', 'selection', 'spellchecker', 'editing' ] },
6		{ name: 'forms', groups: [ 'forms' ] },
7		'/','/',
8		{ name: 'basicstyles', groups: [ 'basicstyles', 'cleanup' ] },
9		{ name: 'paragraph', groups: [ 'list', 'indent', 'blocks', 'align', 'bidi', 'paragraph' ] },
10		{ name: 'links', groups: [ 'links' ] },
11		{ name: 'insert', groups: [ 'youtube','insert' ] },
12		'/',
13		{ name: 'styles', groups: [ 'styles' ] },
14		{ name: 'colors', groups: [ 'colors' ] },
15		{ name: 'tools', groups: [ 'tools' ] },
16		{ name: 'others', groups: [ 'others' ] },
17		{ name: 'about', groups: [ 'about' ] }
18	];
19
20	config.removeButtons = 'Find,Print,Preview,NewPage,Save,Templates,Font,FontSize';
21	config.mathJaxLib = '//cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.4/MathJax.js?config=TeX-AMS_HTML';
22	config.entities = false;
23	config.basicEntities = false;
24};