Hello @PPETS, 
This area (including the Paracel Islands and Spratly Islands) is a disputed territory, and it is usually labeled in the language of the country that actually controls the territory; information about territorial disputes is typically noted in administrative relations and tags. Simply renaming elements such as roads to "Hoàng Sa Của Việt Nam" is a destructive behavior, and does not help on labeling features on disputed territories.
Therefore, I have restored some of the damaged data because OSM follows the "de facto" principle. If you still have questions, feel free to communicate.