User:PPenloglou-WMF/common.js

// Check if we're editing a page.
if (["edit", "submit"].indexOf(mw.config.get("wgAction")) !== -1) {
  // Add a hook handler.
  mw.hook("wikiEditor.toolbarReady").add(function ($textarea) {
    // Configure a new toolbar entry on the given $textarea jQuery object.
    $textarea.wikiEditor("addToToolbar", {
		section: 'advanced',
        group: 'format',
        tools: {
            "comment": {
                label: 'Comment',
                type: 'button',
                icon: '//upload.wikimedia.org/wikipedia/commons/3/37/Btn_toolbar_commentaire.png',
                action: {
                    type: 'encapsulate',
                    options: {
                        pre: "<!-- ",
                        post: " -->"
                    }
                }
            }
        }
    });
  });
}