Language was definitely an issue for me in China. When sales people started talking to me in Mandarin, I’d stop them and ask if they spoke English. Luckily, there would be another customer close by who stepped forward to translate. So being a Chinese in China who couldn’t speak the local language, I found some local signs amusing, even if it was just a typo. My favorite is the last one.
Sign advertising bestselling tea in Guilin
Warning sign in Pudong Airport, Shanghai
Coffee shop in Shanghai airport
Sign in hotel
Entrance to The Great Wall
Restaurant in Yangshuo
I thought this restaurant served roast chicken. It didn’t.
Vendor stall in Yangshuo
Day's Lee 
I’m not sure if they are typos (LOL) because I see similar language errors on signs in Greece and other places I’ve travelled. I think the people making the signs simply don’t refer the proper sources (aka dictionaries) or refer to invalid sources like tourists or someone they know who took a language course once upon a time.
I think you’re right.
Can totally related to the Chinese but can’t speak Mandarin aspect! Love spotting translation mistakes though, they’re so funny :’)