How would i go about changing on the invoice where it says "Included Vat" to "Included Tax"? Also is there a way to add a logo to the invoices?
All texts are stored in the language files. You may change the text there. If you want to know how to change texts in the language files, have a look at the translation guide in the tipps & tricks forum. To add a logo, you will have to change the ispconfig sources of the invoice script