use javascript mode for jsx files

node_modules/ace/lib/ace/ext/modelist.js

@@ -92,7 +92,7 @@ var supportedModes = {
     Jack:        ["jack"],
     Jade:        ["jade"],
     Java:        ["java"],
-    JavaScript:  ["js|jsm"],
+    JavaScript:  ["js|jsm|jsx"],
     JSON:        ["json"],
     JSONiq:      ["jq"],
     JSP:         ["jsp"],