Show error message when logging in failed

[pheyvaer]

When the email is wrong the response is

{
    "name": "AssertionError",
    "message": "Account does not exist",
    "statusCode": 500,
    "stack": "..."
}

When the email is correct, but the password is wrong the response is

{
    "name": "AssertionError",
    "message": "Incorrect password",
    "statusCode": 500,
    "stack": "..."
}

When the IDP is incorrect then there are multiple options:

• If I use https://pod.playground.solidlab.be/idp/credentials2/ then the response is a 401.
• If I use a domain that doesn't exist the fetch function will throw an error.
• If I use a wrong domain like https://google.com/ I get a 405.
• If I use a wrong domain with a path like https://google.com/idp/credentials/ I get a 404.