[TYPO3-dev] condition on language

[Stig Nørgaard Færch]

I have some typoscript in an extension which should only be included 
when a specific language is activated.

I know that I could use GP:L, but the same value on two systems would 
not necessarily correspond to the same language.

So I thought that I could do something like:
[globalVar = TSFE:lang = dk]
But lang doesn't seem to be available as condition?

Any ideas how to solve this?