I was looking at the ftb launcher log and this is what I see:
[21:54:27] [INFO] OptionsPane.<init>:156: [i18n] Added 0 enUS to options pane
[21:54:27] [INFO] OptionsPane.<init>:156: [i18n] Added 1 cyGB to options pane
[21:54:27] [INFO] OptionsPane.<init>:156: [i18n] Added 2 daDK to options pane...