add generalReducer to store settings

src/actions/generalActions.js

@@ -1,4 +1,4 @@
-import { VISIT } from './types';
+import { VISIT, LANGUAGE, RENDERER, STATISTICS } from './types';
 
 
 export const visitPage = () => (dispatch) => {
@@ -6,3 +6,24 @@ export const visitPage = () => (dispatch) => {
     type: VISIT
   });
 };
+
+export const setLanguage = (language) => (dispatch) => {
+  dispatch({
+    type: LANGUAGE,
+    payload: language
+  });
+};
+
+export const setRenderer = (renderer) => (dispatch) => {
+  dispatch({
+    type: RENDERER,
+    payload: renderer
+  });
+};
+
+export const setStatistics = (showStatistics) => (dispatch) => {
+  dispatch({
+    type: STATISTICS,
+    payload: showStatistics
+  });
+};