Ya esta disponible para descarga individual o total y para la ultima distribución de Windows 7 (7137) el paquete de lenguajes que te permira traducirlo al idioma que prefieras:

Download Windows 7 Build 7137 32bit (x86) Language Packs

English (EN-US): en-us_x86.zip
Arabic (AR-SA): ar-sa_x86.zip
Bulgarian (BG-BG): bg-bg_x86.zip
Simplified Chinese (ZH-CN): zh-cn_x86.zip
Traditional Chinese Hong Kong(ZH-HK): zh-hk_x86.zip
Traditional Chinese Taiwan(ZH-TW): zh-tw_x86.zip
Croatian (HR-HR): hr-hr_x86.zip
Czech (CS-CZ): cs-cz_x86.zip
Danish (DA-DK): da-dk_x86.zip
Dutch (NL-NL): nl-nl_x86.zip
Estonian (ET-EE): et-ee_x86.zip
Finnish (FI-FI): fi-fi_x86.zip
French (FR-FR): fr-fr_x86.zip
German (DE-DE): de-de_x86.zip
Greek (EL-GR): el-gr_x86.zip
Hebrew (HE-IL): he-il_x86.zip
Hungarian (HU-HU): hu-hu_x86.zip
Italian (IT-IT): it-it_x86.zip
Japanese (JA-JP): ja-jp_x86.zip
Korean (KO-KR): ko-kr_x86.zip
Latvian (LV-LV): lv-lv_x86.zip
Lithuanian (LT-LT): lt-lt_x86.zip
Norwegian (NB-NO): nb-no_x86.zip
Polish (PL-PL): pl-pl_x86.zip
Portuguese (PT-PT): pt-pt_x86.zip
Brazilian Portuguese (PT-BR): pt-br_x86.zip
Romanian (RO-RO): ro-ro_x86.zip
Russian (RU-RU): ru-ru_x86.zip
Serbian or Latin (SR-LATN-CS): sr-latn-cs_x86.zip
Slovak (SK-SK): sk-sk_x86.zip
Slovenian (SL-SI): sl-si_x86.zip
Spanish (ES-ES): es-es_x86.zip
Swedish (SV-SE): sv-se_x86.zip
Thai (TH-TH): th-th_x86.zip
Turkish (TR-TR): tr-tr_x86.zip
Ukrainian (UK-UA): uk-ua_x86.zip

Download Windows 7 Build 7137 64bit (x64) Language Packs

English (EN-US): en-us_x64.zip
Arabic (AR-SA): ar-sa_x64.zip
Bulgarian (BG-BG): bg-bg_x64.zip
Simplified Chinese (ZH-CN): zh-cn_x64.zip
Traditional Chinese Hong Kong (ZH-HK): zh-hk_x64.zip
Traditional Chinese Taiwan(ZH-TW): zh-tw_x64.zip
Croatian (HR-HR): hr-hr_x64.zip
Czech (CS-CZ): cs-cz_x64.zip
Danish (DA-DK): da-dk_x64.zip
Dutch (NL-NL): nl-nl_x64.zip
Estonian (ET-EE): et-ee_x64.zip
Finnish (FI-FI): fi-fi_x64.zip
French (FR-FR): fr-fr_x64.zip
German (DE-DE): de-de_x64.zip
Greek (EL-GR): el-gr_x64.zip
Hebrew (HE-IL): he-il_x64.zip
Hungarian (HU-HU): hu-hu_x64.zip
Italian (IT-IT): it-it_x64.zip
Japanese (JA-JP): ja-jp_x64.zip
Korean (KO-KR): ko-kr_x64.zip
Latvian (LV-LV): lv-lv_x64.zip
Lithuanian (LT-LT): lt-lt_x64.zip
Norwegian (NB-NO): nb-no_x64.zip
Polish (PL-PL): pl-pl_x64.zip
Portuguese (PT-PT): pt-pt_x64.zip
Brazilian Portuguese (PT-BR): pt-br_x64.zip
Romanian (RO-RO): ro-ro_x64.zip
Russian (RU-RU): ru-ru_x64.zip
Serbian or Latin (SR-LATN-CS): sr-latn-cs_x64.zip
Slovak (SK-SK): sk-sk_x64.zip
Slovenian (SL-SI): sl-si_x64.zip
Spanish (ES-ES): es-es_x64.zip
Swedish (SV-SE): sv-se_x64.zip
Thai (TH-TH): th-th_x64.zip
Turkish (TR-TR): tr-tr_x64.zip
Ukrainian (UK-UA): uk-ua_x64.zip

Descarga Completa

32-bit: Windows 7 Build 7137 x86 localpacks and langpacks.torrent
File Name: 7137.0.090521-1745_x86fre_client_langpacks-GRMCLP_DVD.iso and 7137.0.090521-1745_x86fre_client_localpacks-GRMCLPCKFRE_DVD.iso

64-bit: Windows 7 Build 7137 x64 localpacks and langpacks.torrent
File Name: 7137.0.090521-1745_x64fre_client_langpacks-GRMCXLP_DVD.iso and 7137.0.090521-1745_x64fre_client_localpacks-GRMCLPCKXFRE_DVD.iso

Si estas usando el Windows 7 RC, descarga el MUI Language Interface Packs for Windows 7 RC. El zip contiene el archivo lp.cab el cual trae los recursos de lenguaje. Si no sabes como instalarlo puedes guiarte por aqui: how to install a LIP in Windows 7. Este MUI language packs puede ser usado para integrarlo en el archivo de instalación, puedes hacerlo siguiendo estas instrucciones: integrate or slipstream MUI language packs into Windows 7 RC installation disc.