gecko-dev/services/sync/locales/en-US/errors.properties

error.login.reason.network    = Failed to connect to the server
error.login.reason.passphrase = Wrong secret phrase
error.login.reason.password   = Incorrect username or password
error.login.reason.server     = Server incorrectly configured

invalid-captcha = Incorrect words, try again
weak-password   = Use a stronger password