1. You need to edit the email via the menu System>Emails and change all the instances of:
float:left
to:
<?php $lang = JFactory::getLanguage(); if($lang->isRTL()){echo 'float:right';}else{echo 'float:left';} ?>
and all the instances of :
text-align:left
to:
<?php $lang = JFactory::getLanguage(); if($lang->isRTL()){echo 'text-align:right';}else{echo 'text-align:left';} ?>
2. in your bank transfer information field, enter a translation key and then add that translation key as a translation override in your language files:
www.hikashop.com/download/languages.html#modify
That way you will have a different text for each language.