add Romanian translation

i18n/languages.md

@@ -13,6 +13,7 @@
 - [Polish / Polski](/i18n/README.pl.md)
 - [Portuguese / Portuguese](/i18n/README.pt.md)
 - [Portuguese (Brazilian) / Português Brasileiro](/i18n/README.pt-br.md)
+- [Romanian / Română](/i18n/README.ro.md)
 - [Russian / Pусский](/i18n/README.ru.md)
 - [Spanish / Español](/i18n/README.es.md)
 - [Simplified Chinese / 简体中文](/i18n/README.zh-cn.md)