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Maybe this has some clues: http://steamcommunity.com/app/620/discussions/0/846943514104649048/
2. Right-Click on Portal 2 in your Library
3. Select "Properties"
4. In "Language" tab select English
5. In "General" tab click on "Set Launch Options" button
6. Type in "cc_lang english" and press Enter
7. Launch the game
It should be in English now. Works for me, anyway, I have Steam in English but game in Polish.
It's a common issue with Valve games, for some reason they require for you to change Steam language in order to change game language :/