UBER-318: Allow to configure default language (#3342)

Signed-off-by: Andrey Sobolev <haiodo@gmail.com>

packages/theme/src/index.ts

@@ -18,6 +18,15 @@ import { writable } from 'svelte/store'
 
 export { default as Theme } from './Theme.svelte'
 
+/**
+ * @public
+ */
+export const setDefaultLanguage = (language: string): void => {
+  if (localStorage.getItem('lang') === null) {
+    localStorage.setItem('lang', language)
+  }
+}
+
 /**
  * @public
  */