Hi and welcome to the forum!
I will write the response in english for your convenience, even though your (Google Translate's) swedish is flawless
I would say that when it comes to buildings, a majority of the buildings on the STL-site you are linking to are originally made for TS2010 or even older versions of the simulator and should probably work in all Trainz versions TS2009, TS2010, TS2012, even if the download button says TANE. The reason the button says just TANE is because I (the webmaster of the STL-site) have only tested the assets in TANE, when we collected and made packages of them.
Especially the building-packages made by STW on that page you are linking to are made for TRS2004, so those should work in TS2012, I don't think we have made any updates to them.
The only exception on that page that I know of, is tanigardi's beautifully crafted assets, as these are made specifically for TANE.
In case you want to find more swedish building you should try to take a look at the (very unorganized) Trainz download section of this forum:
http://www.e-buzz.se/forum/forumdisplay.php?f=35 Some of these assets can be found on the STL-page as well.