Distinguish between Login Theme and Account Console for an already existing Mail in Keycloak #51676

Description

The message key emailExistsMessage, is used in Login Theme and Account Theme.

Right now both Messages say: "Email already exists."

Value Proposition

I think we can distinguish here between the contexts.

My proposal would be to use:
Account Theme: An account with this email address is already registered.
Login Theme: This email is already associated with an existing account.

Goals

Non-Goals

Discussion

No response

Notes

cc: @ahus1