Fix filename display

Signed-off-by: Matthieu Le Corre <matthieu.lecorre@univ-nantes.fr>

css/style.css

@@ -11,7 +11,7 @@
 }
 
 .readmemd::before {
-	content:"README.md" !important;
+	content: attr(data-filename) !important;
 	color: silver ;
 }
 

src/main.js

@@ -278,6 +278,7 @@ OCA.ReadmeMD.App = {
 
 		if (this.footer.filename !== null ) {
 			this.footer.container.removeClass("hidden") ;
+			$(this.footer.container).attr('data-filename', this.footer.filename);
 			this.fillContainer(this.footer) ;
 
 			if (this.auto_refresh == "true") {