seems like the original text had a little mistake such as
“In order for LaunchBox to see your GOG games, your GOG library must be visible to "All Visotors".”
RetroArch needs to run through a first-time setup process. Press OK to launch RetoArch. After it's done return back to LaunchBox.
I don't think I can fix it, just remind it here
Here is the translation files
Language-zh-CHS 13.12.zip