Add de.js with DE translations

Libraries/locales.js

@@ -2,10 +2,12 @@
     define("locales", [
         'jed',
         'af',
-        'en'
-        ], function (jed, af, en) {
+        'en',
+        'de'
+        ], function (jed, af, en, de) {
             root.locales = {};
             root.locales.af = af;
             root.locales.en = en;
+            root.locales.de = de;
         });
 })(this);

converse.js

@@ -18,6 +18,7 @@
                 "locales": "Libraries/locales",
                 "af": "locale/af/LC_MESSAGES/af",
                 "en": "locale/en/LC_MESSAGES/en",
+                "de": "locale/de/LC_MESSAGES/de",
                 "sjcl": "Libraries/sjcl",
                 "tinysort": "Libraries/jquery.tinysort",
                 "underscore": "Libraries/underscore",