The data-language attribute is no longer of any use, so remove it from the code.

It was only applicable when using CSS pseudo elements to show the language name, which is no longer the case.

Author: nauzilus

plugins/show-language/prism-show-language.css

@@ -2,7 +2,7 @@ div.prism-show-language {
 	position: relative;
 }
 
-div.prism-show-language > div.prism-show-language-label[data-language] {
+div.prism-show-language > div.prism-show-language-label {
 	color: black;
 	background-color: #CFCFCF;
 	display: inline-block;

plugins/show-language/prism-show-language.js

@@ -12,7 +12,6 @@ Prism.hooks.add('before-highlight', function(env) {
 		return;
 	}
 	var language = Languages[env.language] || (env.language.substring(0, 1).toUpperCase() + env.language.substring(1));
-	pre.setAttribute('data-language', language);
 
 	/* check if the divs already exist */
 	var sib = pre.previousSibling;
@@ -21,23 +20,19 @@ Prism.hooks.add('before-highlight', function(env) {
 		sib.firstChild &&
 		/\s*\bprism-show-language-label\b\s*/.test(sib.firstChild.className)) {
 		div2 = sib.firstChild;
-		if (div2.getAttribute('data-language') !== language) {
-			div2.setAttribute('data-language', language);
-			div2.innerHTML = language;
-		}
 	} else {
 		div = document.createElement('div');
 		div2 = document.createElement('div');
 
 		div2.className = 'prism-show-language-label';
-		div2.setAttribute('data-language', language);
-		div2.innerHTML = language;
 
 		div.className = 'prism-show-language';
 		div.appendChild(div2);
 
 		pre.parentNode.insertBefore(div, pre);
 	}
+	
+	div2.innerHTML = language;
 });
 
 })();