Hi,
The payment information of the bank transfer payment method can be modified in the "information" textarea of the settings of the payment method when you edit it via the menu System>Payment methods.
And if you want to change the text of the instructions, you can use translation overrides:
www.hikashop.com/download/languages.html#modify
I don't recommend modifying the views for that. It's not necessary, it will be less future-proof than translation overrides, and translation overrides will affect also the emails, not only the page after the checkout so it's better than scaterring the changes across several places