yes I used one module Of manufacturer for two languages.
If you use the translation features built into Joomla and VirtueMart, you need one manufaturer module for each language (one for Latvian and one for Russian)
I used falang plugin for my site translation. Sorry my english is very bad;)
Nobody in the VirtueMart team uses Falang for translations, because translations perfectly work without it. So we can't help you with this one. I suppose Falang doesn't work with newer versions of VirtueMart. I would recommend to use the Joomla and VirtueMart translation features instead.