/usr/share/games/jag/data/lang/langlist.dat is in jag-data 0.3.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | Russian::ru
German::de
French::fr
Italiano::it
Dutch::nl
Portuguese::pt
Spanish::es
|