There is no an universal way to change the document template. Any existing ways contain a potential risk of QC stability.
Unfortunately, Mercury does nothing for QC in comparison to Test Director to make the template more flexible.
Regarding changing labels, you can write a simple macros in Word to rename from one language into another.
Uck! Wait, you mean that once we upgrade to QC there is *less* flexibility in reporting? I just learned about the possibility of fiddling with the xsl file in TD 8.0. I was hoping that with our impending upgrade things would improve.
QC and TD don't flexible in the reporting if you use your own templates. Generation in Excel format doesn't help.
So, how I heard on the Mercury seminar to get report in your own template you should try to use Borland Crystal Report.