Looking at much of the traffic on the asset store, and non-USA visitors seem to be a big part of it (China, Russia, etc).
To satisfy this market (and target them for SEO), I will do something relating to using the google translate api to translate the various assets and text in the site. Urls will be something like /en/assets/tag1/tag2/SomeAssetName
and english will be the default, with a page that will allow you to switch to the other languages. Asset translation will be kinda lazy done for whenever it works best for processing. Also, a link to see original language (perhaps english) will be provided.
Handling tag translation will be tricky as that is part of navigation.