No need to re-install. Just open the launcher, but don't hit start. Choose the flag of language which you want at the bottom of launcher, then hit start. Hoped this helped.
just push at the laucher a launges its will yhelp smae problem here -.-
srry for bad english
*nl* starZ
try change language in Region and language and change system locate to english
hope you can play s4 league soon
u havn't choose the lang. there is some flags in the end of the luncher choose american one , then that's it