Support ISO-639-3

[GauthierPLM]

Hi,

Could you support the ISO-639-3 standard? A lot of codes are currently missing (for example for mandarin or cantonese). Here is a list of missing codes I found :

arz
yue
swh
wuu
zsm
qya
pes
nan
acm
lvs
orv
lzh
sjn
nov
ksh
tpw
lld
pms
pnb
npi
avk
prg
crs
ckt
zlm
cbk
lkt
arq
pcd
bar
mhr
mrj
osx
pfl
mgm
dng
liv
vro
apc
jdt
pdc
ppl
shs
mnw
ngt
hif
lzz
oar
brx
mww
hak
nlv
ngu
vec
lou
fuc
gag
lfn
kjh
cyo
urh
kzj
lmo
egl
dtp
max
fuv
nch
hoc
gbm
mvv
ary
kxi
rif
kek
aii
mfe
bvy
bcl
hnj
nst
afb
quc
tmw
bjn
cjy
hsn
gan
tzl
dws
ldn
sgs
vep
rue
tly
ext
swg
izh
jam
cmo
kpv
koi

[brauliobo]

that would be great!! it seems though this project is missing active maintainers