Cleanup and simplify JS code

Change-Id: I393e22763c1a1d18878026bf459b747b150429fb
diff --git a/dev/js/src/loc/de.js b/dev/js/src/loc/de.js
index 537e5b2..631c55e 100644
--- a/dev/js/src/loc/de.js
+++ b/dev/js/src/loc/de.js
@@ -1,5 +1,5 @@
 define(function () {
-  var loc = KorAP.Locale;
+  const loc = KorAP.Locale;
   loc.OR = 'oder';
   loc.AND = 'und';
   // EMPTY, DELETE