make i18n express endpoint await for the plugin loading process to end

Signed-off-by: Alberto Iannaccone <[email protected]>

packages/core/src/node/i18n/localization-backend-contribution.ts

@@ -29,13 +29,22 @@ export class LocalizationBackendContribution implements BackendApplicationContri
     @inject(LocalizationProvider)
     protected readonly localizationProvider: LocalizationProvider;
 
+    @inject(PluginDeployer)
+    protected readonly pluginDeployer: PluginDeployerImpl;
+
+    protected readonly initialized = new Deferred<void>();
+
     async initialize(): Promise<void> {
+        this.pluginDeployer.onDidDeploy(() => {
+            this.initialized.resolve();
+        });
         await this.localizationRegistry.initialize();
     }
 
     configure(app: express.Application): void {
-        app.get('/i18n/:locale', (req, res) => {
+        app.get('/i18n/:locale', async (req, res) => {
             let locale = req.params.locale;
+            await this.initialized.promise;
             locale = this.localizationProvider.getAvailableLanguages().some(e => e.languageId === locale) ? locale : 'en';
             this.localizationProvider.setCurrentLanguage(locale);
             res.send(this.localizationProvider.loadLocalization(locale));