I was delightet to see that - just as LibreOffice itself - LibreOffice Portable now comes as a multilingual install. Saves a lot of hassle diving for the right package.
Are there any plans to pack localized help packs in a portable installer as well?
So far I've helped myself by a) saving the original .xsl files in
into a zip archive then copying the contents of
[systemdrive]\Program Files\LibreOffice 3\Basis\help\
into that folder.