The following line is untranslatable:
<?php _e(sprintf("You don't have any Campaign Monitor feeds configured. Let's go %screate one%s!", '<a href="admin.php?page=gf_campaignmonitor&view=edit&id=0">', "</a>"), "gravityformscampaignmonitor"); ?>
"You don't have any Campaign Monitor feeds configured. Let's go %screate one%s!"
Could you please change _e(sprintf( to printf(__(?