Add Andreu-G and yinhwa as stewards

Author: Qianqianye

README.md

@@ -35,10 +35,10 @@ Once added, a steward's username will remain in the [stewards section of the rea
 ### Translation Steward(s) 
 | Language | Steward(s)                |
 | -------- | ------------------------- |
-| Overall  |  [@Qianqianye](https://github.com/Qianqianye),[@limzykenneth](https://github.com/limzykenneth) |
-| Spanish  |   [@Guirdo](https://github.com/Guirdo)                        |
+| Overall  |[@Qianqianye](https://github.com/Qianqianye),[@limzykenneth](https://github.com/limzykenneth) |
+| Spanish  |[@Guirdo](https://github.com/Guirdo), [@Andreu-G](https://github.com/Andreu-G)                |
 | Chinese  |                           |
-| Korean   |                           |
+| Korean   | [@yinhwa](https://github.com/yinhwa)                         |
 | Hindi    |                           |
 
 ## Setup