Hello!
I have done and checked each and every step from this topic.
I have:
Joomla! 1.5.22
VirtueMart 1.1.7a
Language_Pack_for_VirtueMart_1.0.15
These do not work together, right?
First of all. In the very first post in this topic Pisu (thanks man!) show how to extract and copy the "languages" folder to administrator/components/com_virtuemart/
But in this version there is already folder called "languages"! So I use my own brains and I copy just the finnish.php (I want Finnish language) to this administrator/components/com_virtuemart/languages folder. Then I upload.
Nothing, english remains like with so many others here too

Then somebody in this same topic said that this same finnish.php file should also be copied to each and every folder I can find inside administrator/components/com_virtuemart/languages.
Sounds grazy but I dot it. Then I get this error message in the front end:
Fatal error: Cannot redeclare class vmLanguage in /home/catchlinef/domains/catchline.fi/public_html/joomlatest/administrator/components/com_virtuemart/languages/common/finnish.php on line 1879
So i guess we have to wait for a new language pack for VM 1.1.7a and then a decent step-by-step guide. So sad that new users like me have to spend 2-3 hours untill we give up and think it´s about uncompatible versions.
In fact it can be seen from the download-page
http://virtuemart.net/downloadsthat there is no language files but only to VirtueMart 1.0.15!