Unicode tick without colour

https://github.com/marienfressinaud/FreshRSS/issues/560
The former was green in Firefox 32 beta

app/views/helpers/pagination.phtml

@@ -14,7 +14,7 @@
 	<?php } elseif ($markReadUrl) { ?>
 	<a id="bigMarkAsRead" href="<?php echo $markReadUrl; ?>"<?php if ($this->conf->reading_confirm) { echo ' class="confirm"';} ?>>
 		<?php echo Minz_Translate::t ('nothing_to_load'); ?><br />
-		<span class="bigTick">✔</span><br />
+		<span class="bigTick">✓</span><br />
 		<?php echo Minz_Translate::t ('mark_all_read'); ?>
 	</a>
 	<?php } else { ?>