Language argument defaults to english unless --L is used

[guilsa]

Documentation states -L should be used but the following call defaults to an english subtitle download

getsub -L fr .

whereas --L works:

getsub --L fr .

[byroot]

From the -h summary:

-l, --language LANGUAGE          Sub language ISO 639-2 code like fre or eng. Default: env $LANG     

-L, --language-extension         Add the ISO 639-2 in the subtitle's file extension. e.g filename.eng.srt

Basically I thin you want -l not -L

[guilsa]

Thanks @byroot, you're correct.