Description

Hi Symfony developer!
On behalf of https://www.bewelcome.org/ (a major Symfony user base of about 256k users according to current statistics), I'd like to request a string change.

End-users might not understand what a CSRF token is.

Perhaps a new string could give a user-friendly error message using simple words instead of "Invalid CSRF token"? Something like "You've already logged in somewhere else, please try again to log in here".

We then have a dedicated team of volunteer translators who can put the string into other languages as needed.

Best regards,
peterburk

Example

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