New registration: the check of the required e-mail address rejects valid addresses with a plus sign (+) in the local-part

E-Mail addresses with a plus sign in the local-part are valid. I couldn't find the cause of the problem. The check is done in view/js/mod_register.js. Seems everything allright.

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New registration: the check of the required e-mail address rejects valid addresses with a plus sign (+) in the local-part