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:
http://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):
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