Add Russian language to settings page

client/src/app/content/settings/settings.component.html

@@ -66,6 +66,7 @@
 		<option value="en">English</option>
 		<option value="es">Español</option>
 		<option value="pl">Polski</option>
+		<option value="ru">русский</option>
 		<option value="zh">中文</option>
 	</select>
 </div>

client/src/app/core/language.module.ts

@@ -20,7 +20,7 @@ export const HttpLoaderFactory = (http: HttpClient): TranslateHttpLoader => {
 	exports: []
 })
 export class LanguageModule {
-	readonly VALID_LANGUAGES = ["en", "es", "pl", "zh"];
+	readonly VALID_LANGUAGES = ["en", "es", "pl", "ru", "zh"];
 
 	constructor(private languageService: LanguageService) {
 		this.setup();