Use asyncForEachHandler(), it's more efficient

package.json

@@ -55,7 +55,7 @@
         "c9"
     ],
     "c9plugins": {
-        "c9.ide.language": "#28ddaa1836",
+        "c9.ide.language": "#f6e4cb5ee4",
         "c9.ide.language.css": "#a649f2a710",
         "c9.ide.language.generic": "#77d43cfaf0",
         "c9.ide.language.html": "#0f4078c187",