Change default text in standard PDF templates

Change default text in standard PDF templates

For Internationalization it would be nice if the at the moment unchangable
word elements of the standard templates like

Invoice = Rechnung
Bill to = Rechnungsanschrift Rechnungsadresse

could be changed in the settings dialog.

Regarding the XML standard templates and the HTML individual templates:
Do they use different PDF libraries at creation time. We see some versions
of PDF readers converters giving different results with these two types of PDF.