add generalReducer to store settings

src/reducers/generalReducer.js

@@ -1,8 +1,11 @@
-import { VISIT } from '../actions/types';
+import { VISIT, LANGUAGE, RENDERER, STATISTICS } from '../actions/types';
 
 
 const initialState = {
-  pageVisits: 0 // detect if previous URL was
+  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
 };
 
 export default function(state = initialState, action){
@@ -12,6 +15,23 @@ export default function(state = initialState, action){
         ...state,
         pageVisits: state.pageVisits += 1
       };
+    case LANGUAGE:
+      return {
+        ...state,
+        language: action.payload
+      };
+    case RENDERER:
+      window.localStorage.setItem('renderer', action.payload);
+      return {
+        ...state,
+        renderer: action.payload
+      };
+    case STATISTICS:
+      window.localStorage.setItem('statistics', action.payload);
+      return {
+        ...state,
+        statistics: action.payload
+      };
     default:
       return state;
   }