When browsing for assets to link or append, it makes sense that
they're translated if that is what one is used to in the interface.

I've got two issues with this patch:

• I'm not sure whether those should be IFACE_ or TIP_; when following a tutorial, one may want to see the same names, but they also are definitely part of the interface.
• The names use the MainCollectionDef->type values, which never get extracted for some types (FreeStyleLineStyle, WorkSpace). Should these simply be extracted through N_tags in RNA_def_main(), or automatically in the RNA dumping function?...