MediaWiki:Common.js

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$( '#wpTextbox1' ).wikiEditor( 'addToToolbar', {
        'sections': {
                'annotations': {
                        'type': 'toolbar', // Can also be 'booklet'
                        'label': 'Annotations'
                        // or 'labelMsg': 'section-emoticons-label' for a localized label
                }
        }
} );