Update publicdisplayname.php

In line 11 change "How is your name" to "Please enter your name!"

templates/publicdisplayname.php

@@ -8,7 +8,7 @@
 	<fieldset class="warning">
 		<h2><?php p($_['room']) ?></h2>
 		<?php if (!isset($_['wrongdisplayname']) || !$_['wrongdisplayname']): ?>
-			<p><?php p($l->t('How is your name?')); ?></p>
+			<p><?php p($l->t('Please enter your name!')); ?></p>
 		<?php endif; ?>
 		<?php if (isset($_['wrongdisplayname']) && $_['wrongdisplayname']): ?>
 			<div class="warning"><?php p($l->t('The name must be at least 3 characters long.')); ?></div>
@@ -22,4 +22,4 @@
 				class="svg icon-confirm input-button-inline" value="" />
 		</p>
 	</fieldset>
-</form>
+</form>