All security updates and many quarterly updates do not deliver separate MUI installers.
From the Admin Guide:
http://www.adobe.com/devnet-docs/acrobatetk/tools/AdminGuide/basics.html#multilanguage-installers
2.10 Multilanguage installers¶
Note: MUI installers are only created in tandem with full MSI installers. They are not created for MSP updates and patches. For example, 10.0 and 10.1 include MUI installers while 10.0.1, 10.0.2, and 10.0.3 do not. What this means for your deployment methodology is that you simply install the generic installer over your MUI install if there is a no MUI-specific installer. If there is a MUI-specific installer, you must use that. Download the MUI installer from ftp.adobe.com/pub/adobe/reader/.
Ben