rapid7/metasploit-framework — pull request #4383 by wez3 (2014-12-12 19:12:15+00:00)
Title: Update outlook rb, "NL" to "nl_NL"

I found at that the "System language" value is "nl_NL" instead of "NL" for a dutch system. This has to be updated in order to successfully detect a dutch operating system.