ISO 639-3 

Hi Kowey, maybe you remember me from meta:Language_codes. Since SIL is now ISO 639-3 chances are better for transition to 3-letter codes. I started List of 639-1 codes, which could serve as a transition table one day. Maybe help expanding the list, and have a look at Category:ISO 639 with the subcat for 639-redirects.  (Talk)