How do I change Portal 2 subtitle language?

I'm a native English speaker (born in US to Swedish parents) and I run a Swedish YouTube channel.

Would it be possible to set Portal 2 CC to Swedish? I've set the language in Steam to Swedish (Right-Click on Portal 2 > Properties > Language > Swedish (Sweden)) but that only changed the interface language.

I've tried using dev console by typing "cc_lang swedish", but it says something along the lines of "resource/subtitles_swedish.txt is missing, using resource/subtitles_english.txt instead" even though I checked the folder, and the file is there, I opened it and everything seems to work, therefore the file isn't corrupted.

I tried using "Verify Game Cache Integrity" and that passes fine too.

Screenshot of "resource" folder that shows the file exists:

Portal 2 dosent support swedish subtitles http://store.steampowered.com/app/620/ On the portal 2 Languages tab it says:

--------------| Interface | Full audio | subtitles |

Swedish: ____✓________X________X

Which means Swedish supports only the interface... Maybe there is a Swedish mod!