fixed typo

functions/addressbook.php

@@ -315,7 +315,7 @@
 	 }
 
 	 if(eregi('[ \\:\\|\\#\\"\\!]', $userdata['nickname'])) {
-	    $this->error = _("Nickname contain illegal characters");
+	    $this->error = _("Nickname contains illegal characters");
 	    return false;
 	 }
 
@@ -478,4 +478,4 @@
 
    }
 
-?>
+?>