First create an extra field with the name "Read More Text"...

 

Then, replace:

<?php echo JText::('Read more...') ?>

With:

<?php $readmoreTxt = JText::_( 'Read more...' ); $this->item->extra_fields = K2ModelItem::getItemExtraFields($this->item->extra_fields); if ( $this->item->extra_fields ){ foreach ($this->item->extra_fields as $key=>$extraField){ if ( $extraField->name == 'Read More Text' ) $readmoreTxt = $extraField->value; }} echo $this->escape($readmoreTxt); ?>