get locale from user if exists

src/reducers/generalReducer.js

@@ -1,11 +1,35 @@
 import { VISIT, LANGUAGE, RENDERER, STATISTICS } from '../actions/types';
 
+const initialLanguage = () => {
+  if (window.localStorage.getItem('locale')) {
+    return window.localStorage.getItem('locale');
+  }
+  if (navigator.language === 'de-DE'){
+    return 'de_DE';
+  }
+  return 'en_US';
+};
+
+const initialRenderer = () => {
+  if (window.localStorage.getItem('renderer')) {
+    return window.localStorage.getItem('renderer');
+  }
+  return 'geras';
+};
+
+const initialStatistics = () => {
+  if (window.localStorage.getItem('statistics')) {
+    return JSON.parse(window.localStorage.getItem('statistics'));
+  }
+  return false;
+};
+
 
 const initialState = {
   pageVisits: 0, // detect if previous URL was
-  language: 'de',
-  renderer: window.localStorage.getItem('renderer') || 'geras',
-  statistics: window.localStorage.getItem('statistics') === 'true' ? true : window.localStorage.getItem('statistics') === 'false' ? false : false
+  language: initialLanguage(),
+  renderer: initialRenderer(),
+  statistics: initialStatistics()
 };
 
 export default function(state = initialState, action){