David, I was three sheets to the wind when I posted. No wonder it didn't make sense. The missing post threw me off too.
Here is a snippet from a 4.4.5 cart /common_files/customer/main/welcome.tpl
Code:
<h1>{$lng.lbl_welcome_back|substitute:"name":$display_greet_visitor_name} </h1>
Then looking at the language variable lbl_welcome_back we see this:
Code:
Welcome back, {{name}}
The important part is "|substitute:"name":$display_greet_visitor_nam e" when you call the language variable in the template.
Make sense now? As I understand it, you want to use a smarty variable in a language variable. You have done the right thing encapsulating your variable in the language entry with {{this}} now you need to use "|substitute" when you call the language variable in the template.