save selected language to local storage

src/actions/LocalStorageActions.js

@@ -52,6 +52,7 @@ const KEY_DISCOVERY: string = `${STORAGE_PATH}discovery`;
 const KEY_TOKENS: string = `${STORAGE_PATH}tokens`;
 const KEY_PENDING: string = `${STORAGE_PATH}pending`;
 const KEY_BETA_MODAL: string = '/betaModalPrivacy'; // this key needs to be compatible with "parent" (old) wallet
+const KEY_LANGUAGE: string = `${STORAGE_PATH}language`;
 
 // https://github.com/STRML/react-localstorage/blob/master/react-localstorage.js
 // or
@@ -235,6 +236,14 @@ const loadStorageData = (): ThunkAction => (dispatch: Dispatch): void => {
             });
         }
     }
+
+    const language: ?string = storageUtils.get(TYPE, KEY_LANGUAGE);
+    if (language) {
+        dispatch({
+            type: WALLET.SET_LANGUAGE,
+            language: JSON.parse(language),
+        });
+    }
 };
 
 export const loadData = (): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
@@ -250,3 +259,8 @@ export const hideBetaDisclaimer = (): ThunkAction => (dispatch: Dispatch): void
     storageUtils.set(TYPE, KEY_BETA_MODAL, true);
     dispatch(loadJSON());
 };
+
+export const setLanguage = (): ThunkAction => (dispatch: Dispatch, getState: GetState): void => {
+    const { language } = getState().wallet;
+    storageUtils.set(TYPE, KEY_LANGUAGE, JSON.stringify(language));
+};

src/services/LocalStorageService.js

@@ -25,6 +25,10 @@ const LocalStorageService: Middleware = (api: MiddlewareAPI) => (next: Middlewar
         case WALLET.HIDE_BETA_DISCLAIMER:
             api.dispatch(LocalStorageActions.hideBetaDisclaimer());
             break;
+
+        case WALLET.SET_LANGUAGE:
+            api.dispatch(LocalStorageActions.setLanguage());
+            break;
         // first time saving
         case CONNECT.REMEMBER:
             api.dispatch(LocalStorageActions.save());