The way you changed the VAT lines is the quick 'n dirty method to do so and is not recommended as they will get overwritten when the next update is done. The correct way is to make a change in the language .po file and compile it into the .mo file and then use it.
As an example, the standard latin1 en_US.po file is at:
https://github.com/apmuthu/frontac24/blob/master/FA24Mods/lang/en_US/LC_MESSAGES/en_US.po
and is for the standard compiled one at:
https://github.com/apmuthu/frontac24/tree/master/core/lang/en_US/LC_MESSAGES
The UTF-8 version for the en_US lang files are at:
https://github.com/apmuthu/frontac24/tree/master/FA24Mods/lang/en_US-UTF8/LC_MESSAGES
All languages necessary to be choosable must find their folders in the lang folder and be present in the lang/installed_languages.inc file.
Setup => Display Setup will navigate to the Preferences page that can also be reached using the Preferences link at the top menu near the Logout link. Your user role access permission should allow for it to be visible.
Setup => Transaction References is where the Forms Setup is located.
@joe: it would be nice to split the comments at the bottom of all reports to wrap at some width suitable for each report.