German auto correct in Apple Mail.

Instead of writing a customer this:
"Dear xxx, I finished your paginator."

I wrote and send this:
"Dear xxx, I finished your pakistani."

He wondered but took it with humor :)

I remember some years ago a phone call between my boss and a customer.
The customer wanted a website from us, and my boss told him what it would aproximately cost (it wasn't very much).
Customer got upset and said "How can it be so expensive? You're not saving lifes, are you?"

It never came to a contract, and I now work at a real company ...

I'm quite happy with my job as a full stack web developer, but I'd like to have a raise.

Is there any reliable source helping me finding out what I'm worth? I have no idea how much more I can ask from my boss.

Living and working in germany btw.