Touhou 15.5 steam help

[GundamFan15]

I need help or advise

Touhou 15.5 is on steam and clams that their is no English language option as noted in the orange box, however when I was looking thought the options their is a option to switch to English for the whole game.

Seeing this false advising as harming the games chance of being sold, I want to contact steam and note them of this error, but I don't know how?

Anyone got any good ides to help ?