You can find all sources available for filtering in the dropdowns for language filter from each stream chosen. The following is the list that depends on each source:
For Twitter:
ar - Arabic
zh - Chinese
zh - cn - Chinese Simplified
zh - tw - Chinese Traditional
da - Danish
nl - Dutch
en - English
fi - Finnish
fr - French
de - German
el - Greek
he - Hebrew
id - Indonesian
it - Italian
ja - Japanese
ko - Korean
no - Norwegian
fa - Persian
pl - Polish
pt - Portuguese
ru - Russian
es - Spanish
sv - Swedish
th - Thai
tr - Turkish
uk - Ukrainian
For other sources (Instagram, Facebook, YouTube):
af - Afrikaans
bn - Bengali
de - German
es - Spanish
fi - Finnish
he - Hebrew
hu - Hungarian
ja - Japanese
lt - Lituanian
ml - Malayalam
nl - Dutch
pl - Polish
ru - Russian
so - Somali
sw - Swahili
th - Thai
uk - Ukrainian
zh-cn - Chinese (S)
ar - Arabic
cs - Czech
el - Greek
et - Estonian
fr - French
hi - Hindi
id - Indonesian
kn - Kannada
lv - Latvian
mr - Marathi
no - Norwegian
pt - Portuguese
sk - Slovak
sq - Albanian
ta - Tamil
tl - Tagalog
ur - Urdu
zh-tw - Chinese (T)
bg - Bulgarian
da - Danish
en - English
fa - Persian
gu - Guyarati
hr - Croatian
it - Italian
ko - Korean
mk - Macedonian
ne - Nepali
pa - Panyabi
ro - Romanian
sl - Slovenian
sv - Swedish
te - Telugu
tr - Turkish
vi - Vietnam