Battlefield 3 Language Files and Instructions
Download the language files which you want and copy the files to "YOURPROGRAMFILESFOLDER"\Origin Games\Battlefield3\Data\Win32\Loc folder
Also you need to copy Update folder to Battlefield 3 main folder.
All Language Files: Main Patch, Update 06 December 2011, Update 4 September 2012
Registry Instructions:
1. Download: http://cdkeyshere.com/files/BF3_Lang.exe
Run the software, select your language and click Activate language.
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2. Start/Run/regedit
on 32 bit Windows; Find: [HKEY_LOCAL_MACHINE\SOFTWARE\EA Games\Battlefield 3],
on 64 bit Windows; Find: [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\EA Games\Battlefield 3] and change as below:
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on 32 bit Windows; Find: [HKEY_LOCAL_MACHINE\SOFTWARE\Origin Games\DGR01609244], (if not exist, you can pass this step)
on 64 bit Windows; Find: [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Origin Games\DGR01609244] and change as below: (if not exist, you can pass this step)
Fuente: http://cdkeyshere.com/files/bf3.html