I took in a stray male cat a few months back. I tried to find an owner but no luck.
I got him neutered a few weeks after I took him in and got a few lbs on him. He was half starved when I took him in.
Anyway.
He's had some health issues. I had him tested for FIV at the vet and he was positive.
FIV is like HIV but for cats. Same progression.
Virus slowly decimates the immune system until there is no immune system and cat dies from some common infection that usually their body could easily fight.
It shortens their lifespan considerably. And even minor health problems often persist and get worse. Dental. Skin problems. Lung and heart. Often they lose a lot of weight once it progresses.
It's just a bad situation.
I mention this because it's actually a very common virus in outdoor unneutered males.
It's often spread from fights with each other.
Neutered males don't get in fights as much. Significantly lowering their risk.
Even if the cat already has it, neutering him will reduce chance of him getting hurt from fights. And of spreading it.
Plus street kittens have low life expectancy. Best to help prevent those sad deaths.
Also. Google translate. I've used it to talk to people. It has a voice option. It's clunky but you can use it to talk to the owner.