The following languages can be specified as source language for project, transcription, etc.:

af - Afrikaans
am - Amharic
ar - Arabic
az - Azerbaijan
bg - Bulgarian
bn - Bangla
bs - Bosnian
ca - Catalan
cs - Czech
cy - Welsh
da - Danish
de - German
el - Greek
en - English
es - Spanish
et - Estonian
fa - Persian
fi - Finnish
fr - French
ga - Irish
gl - Galician
gu - Gujarati
he - Hebrew
hi - Hindi
hr - Croatian
hu - Hungarian
id - Indonesian
is - Icelandic
it - Italian
ja - Japanese
jv - Javanese
ka - Georgian
kk - Kazakh
km - Khmer
kn - Kannada
ko - Korean
lo - Lao
lt - Lithuanian
lv - Latvian
mk - Macedonian
ml - Malayalam
mn - Mongolian
mr - Marathi
ms - Malay
mt - Maltese
my - Burmese
nb - Norwegian
ne - Nepali
nl - Dutch
pa - Punjabi
pl - Polish
ps - Pashto
pt - Portuguese
ro - Romanian
ru - Russian
si - Sinhala
sk - Slovak
sl - Slovenian
so - Somali
sq - Albanian
sr - Serbian
su - Sundanese
sv - Swedish
sw - Swahili
ta - Tamil
te - Telugu
th - Thai
tl - Tagalog
tr - Turkish
uk - Ukrainian
ur - Urdu
uz - Uzbek
vi - Vietnamese
zh - Chinese
zu - Zulu