Security error message key translations possibilities (to dutch)

I've been looking for all the error message key translations so can translate them all to dutch. The docu explains the following

'Invalid credentials.': 'The password you entered was invalid!'

So how to "translate" invalid credentials. I want to change all the error message to dutch or make own texts. I already change the default langue to nl:

framework:
default_locale: nl
translator:
    default_path: '%kernel.project_dir%/translations'
    fallbacks:
        - en

But where can i find all the possibilites like: Invalid credentials. i googled a lot but cant seem to find it.