Use better wording.

apps/files_sharing/templates/authenticate.php

@@ -1,7 +1,7 @@
 <form action="<?php p($_['URL']); ?>" method="post">
 	<fieldset>
 		<?php if ($_['wrongpw']): ?>
-		<div class="warning"><?php p($l->t('Wrong password.')); ?></div>
+		<div class="warning"><?php p($l->t('The password is wrong. Try again.')); ?></div>
 		<?php endif; ?>
 		<p class="infield">
 			<label for="password" class="infield"><?php p($l->t('Password')); ?></label>