-langlanguage
Language for user interface. Current version (0.12.0) of fbreader supports Arabic (specify -langar option), Chinese (-langzh), Czech (-langcs), Dutch (-langnl), English (-langen), Finnish
(-langfi), French (-langfr), German (-langde), Hungarian (-langhu), Indonesian (-langid),
Italian (-langit), Lithuanian (-langlt), Russian (-langru), Spanish (-langes) and Swedish
(-langsv) and Ukrainian (-languk).
e-book Name of file to open. If this parameter is missing or if FBReader cannot open the specified file,
the last opened file will be reopened. If you start FBReader for the first time or the last opened
file is missing, "About FBReader" text will be opened.