docs: update supported locales

Author: streamtw

docs/index.md

@@ -17,7 +17,7 @@ This is the document of v2 version, v1 document can be found here: [https://gith
     * Private folders: dedicated folder for each user, only the owner can upload or manage files within
  * Customizable routes, middlewares, views, and folder path
  * Supports two categories: files and images. Each type works in different directory.
- * Supported locales : ar, bg, de, el, en, es, fa, fr, it, he, hu, nl, pl, pt-BR, pt_PT, ro, ru, sv, tr, zh-CN, zh-TW
+ * Supported locales : ar, az, bg, cs, de, el, en, es, eu, fa, fr, he, hu, id, it, ka, nl, pl, pt, pt-BR, ro, rs, ru, sk, sv, tr, uk, vi, zh-CN, zh-TW
 
 PRs are welcome!