jh_magnificpopup: Add filename to description in below right corner

Default_filename.html

;(function($) {
	$('{selector}').each(function() {
		$(this).magnificPopup({
			delegate: 'a:isImageFile',
			tClose: '<f:translate key="tClose" extensionName="JhMagnificpopup"></f:translate>',
			type: 'image',
			tLoading: '<f:translate key="tLoading" extensionName="JhMagnificpopup"></f:translate>',
			mainClass: '<f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.mainClass" />',
			gallery: {
				enabled: <f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.galleryEnabled" />,
				preload: <f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.galleryPreload" />,
				navigateByImgClick: <f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.galleryNavigateByImgClick" />,
				arrowMarkup: '<button title="%title%" type="button" class="mfp-arrow mfp-arrow-%dir%"></button>',
				tPrev: '<f:translate key="tPrev" extensionName="JhMagnificpopup"></f:translate>',
				tNext: '<f:translate key="tNext" extensionName="JhMagnificpopup"></f:translate>',
				tCounter: '<f:translate key="tCounter" extensionName="JhMagnificpopup"></f:translate>'
			},
			image: {
				cursor: '<f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.imageCursor" />',
				titleSrc: function(item) {
					var res = '';
					if (typeof item.el.attr('title') !== typeof undefined && item.el.attr('title') !== '') {
						res = item.el.attr('title');
					}
					if (typeof item.el.attr('data-image-filename') !== typeof undefined && item.el.attr('data-image-filename') !== '') {
						var imageFilename = item.el.attr('data-image-filename')
						imageFilename = imageFilename.substring(0, imageFilename.lastIndexOf('.'));
						if (res == '') {
							res = imageFilename;
						} else {
							res = res.concat(' &middot; ' + imageFilename);
						}
					}
					return res;
				},
				verticalGap: <f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.imageVerticalGap" />,
				verticalFit: <f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.imageVerticalFit" />,
				tError: '<f:translate key="tError" extensionName="JhMagnificpopup"></f:translate>'
			},
			removalDelay: <f:cObject typoscriptObjectPath="plugin.tx_jhmagnificpopup.settings.magnificpopup.templateVariables.removalDelay" />
		});
	});
})(window.jQuery || window.Zepto);

setup.txt

# Override template for mfp javascript (adjust path to your needs)
page.jsFooterInline.109.file = fileadmin/[...]/jh_magnificpopup/Templates/TypoScript/Default_filename.html

# Add required attributes to image link tag
tt_content.image.20.1.params.dataWrap = data-image-filename = "{file:current:name}"
tt_content.image.20.1.imageLinkWrap.linkParams.ATagParams.dataWrap = class="magnificpopup" data-image-filename = "{file:current:name}"