The game launchers language often turn to japanese then it patch again and download again.. what should I do? Help please

:p Eh this is a common problem - a damned annoying one too.
One of the moderators, Ringo Tarte, mentioned that launchers were getting rolled back. There is still no official fix up to this date. You can copy all your files into a backup file and replace the game files with the backup (Delete, copy, paste) when the updates starts again.
[Crediting this answer to Fuusuke. ]