Notify electron of language changes

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/BasePlatform.js

@@ -162,4 +162,6 @@ export default class BasePlatform {
     getEventIndexingManager(): BaseEventIndexManager | null {
         return null;
     }
+
+    async setLanguage(preferredLangs: string[]): Promise<void> {}
 }

src/languageHandler.js

@@ -21,6 +21,7 @@ import request from 'browser-request';
 import counterpart from 'counterpart';
 import React from 'react';
 import SettingsStore, {SettingLevel} from "./settings/SettingsStore";
+import PlatformPeg from "./PlatformPeg";
 
 // $webapp is a webpack resolve alias pointing to the output directory, see webpack config
 import webpackLangJsonUrl from "$webapp/i18n/languages.json";
@@ -285,6 +286,11 @@ export function setLanguage(preferredLangs) {
         preferredLangs = [preferredLangs];
     }
 
+    const plaf = PlatformPeg.get();
+    if (plaf) {
+        plaf.setLanguage(preferredLangs);
+    }
+
     let langToUse;
     let availLangs;
     return getLangsJson().then((result) => {