I contacted Origin and they said that there is no way to change the localization/language setting. Well, turns out there is, but it requires some manual work (been working for me at least). I sat down with a colleague and started looking for localization settings and we found the following stuff...
We basically wanted to go from Swedish to English and this is how we did it...
- Insert disc containing data (you will need to get the dll-files from somewhere and I wont publish it)
- open up SimCity.zip (found on disc) in winrar or some other program
- copy the wanted GDFBinary_*.dll file to your "origin games\simcity" folder (gameFolder)
- in zip file, navigate to SimCityData\Locale\
- copy appropriate language folder into gameFolder\SimCity\Locale
- copy same language folder into gameFolder\SimCityData\Locale
- in zip file, navigate to SimCityRecovery\Locale\
- copy appropriate language folder into gameFolder\SimCityRecovery\Locale
- enter 'regedit' through start menu\run
- navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Maxis\SimCity
- change GDFBinary to your wanted dll-file (E:\games\SimCity\GDFBinary_en_US.dll)
- change locale to wanted language en_US
Enjoy!