Merge branch 'cbayer-add-german-translation-file' into 'master'

wired german translation file

See merge request gridtracker.org/gridtracker!274

If this is changing anything in the UI or operational behavior, please prepare to update the wiki!

package.nw/lib/i18n.js

@@ -1,7 +1,8 @@
 let languages = {
   en: "i18n/en.json",
   cn: "i18n/cn.json",
-  cnt: "i18n/cn-t.json"
+  cnt: "i18n/cn-t.json",
+  de: "i18n/de.json"
 };
 
 function loadi18n()