Where can I change text in the checkout popup prompts?

[t68]

Hi!
I hoper someone can point me to the right files to change and translate the texts in the popup prompts that are displayed in the popups that are shown in the checkout process (i.e you have to select payment method, accept ToS and so on). Cannot find and change these useing Joomla language overrides.

Setup:
J2.5.17  VM2.0.26c  VMtemplates Nano template