Magento : Language pack

1. Germany German
http://www.magentocommerce.com/extension/413/magento-community-modules–german-germany-language-pack

Key : magento-community/Locale_Mage_community_de_DE

2. France and French:
www.magentocommerce.com/extension/414/magento-community-modules–french-france-language-pack

3.Spanish:
http://www.magentocommerce.com/extension/398/magento-community-modules–spanish-spain-language-pack

key: magento-community/Locale_Mage_community_es_ES

4.Portuguese:
http://www.magentocommerce.com/extension/388/magento-community-modules–portuguese-brazil-language-pack

Key : magento-community/Locale_Mage_community_pt_BR

5.Russian:
http://www.magentocommerce.com/extension/391/magento-community-modules–russian-russia-language-pack

key : magento-community/Locale_Mage_community_ru_RU

6.Japanese:
http://www.magentocommerce.com/extension/415/magento-community-modules–japanese-japan-language-pack

Key: magento-community/Locale_Mage_community_ja_JP

7.Italian:
http://www.magentocommerce.com/extension/377/magento-community-modules–italian-italy-language-pack

Key: magento-community/Locale_Mage_community_it_IT

8.Arabic (Saudi Arabia，In addition to Kuwait，Egyptian Arabic):
http://www.magentocommerce.com/extension/353/magento-community-modules–arabic-saudi-arabia-language-pack

key: magento-community/Locale_Mage_community_ar_SA

9.Traditional Chinese:
http://www.magentocommerce.com/extension/409/magento-community-modules–chinese-traditional-taiwan-language-pack

key: magento-community/Locale_Mage_community_zh_TW

10.Simplified Chinese:
http://www.magentocommerce.com/extension/359/magento-community-modules–chinese-simplified-china-language-pack

Key:magento-community/Locale_Mage_community_zh_CN
Or go to http://code.google.com/p/magento-cn/downloads/list下载