From http://en.wikipedia.org/wiki/ISO_639-2:

"While most languages are given one code by the standard, twenty of the languages described have two three-letter codes, a "bibliographic" code (ISO 639-2/B), which is derived from the English name for the language and was a necessary legacy feature, and a "terminological" code (ISO 639-2/T), which is derived from the native name for the language. Each of these twenty languages is also included in the ISO 639-1 standard. (There were 22 B codes; scc and scr are now deprecated.)"

Unfortunately some EPG providers still use those 2 deprecated codes

h4. Steps to Reproduce
Check language selection list in configuration