Change game language.

First: Click on Start button.
Second: Type regedit and then Enter.
Third: Find HKEY_LOCAL_MACHINE\SOFTWARE\Sims
There will be a folder for The Sims 3 and each EPs [if you have them]. Open each folder and duble-click on Locale. Then change the Value Data to the «code» of your country and language.

The following list contains the most usual language and country codes.
Chinese - zh-CN
Czech - cs-CZ
Danish - da-DK
Dutch - nl-NL
English - en-US
French - fr-FR
German - de-DE
Greek - el-GR
Hungarian - hu-HU
Italian - it-IT
Irish - ga-IE
Japanese - ja-JP
Korean - ko-KR
Polish - pl-PL
Portuguese - pt-PT
Romanian - ro-RO
Russian - ru-RU
Spanish - es-ES
Swedish - sv-SE
Ukrainian - uk-UA


After changing Value Data, just close Regedit and start your game. It should run in the language you chose.

Warning! 
Changing the game's language will delete the downloads you did previously!
Be sure you want to do this!

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