Hi,
What entire completion page ?
Mohamed gave you the two used translations ; the rest of the content is the setting "information" of the bank transfer plugin.
If you want to override the "end" view of the plugin ; you have to create the override yourself by copying the file into :
/templates/YOUR_FRONTEND_TEMPLATE/hikashoppayment/banktransfer_end.php
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.