Install
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Simply copy the core_en-us.tlk file to your override directory. This can be found in various places (depending on your OS, although I think there are multiple places you can put the file and it will still work):

_install_directory_packagescoreoverride
My DocumentsBiowareDragon Agepackagescoreoverride

Uninstall
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Delete the core_en-us.tlk file you placed in the override folder.