Fix language tags in dataset cards (#4826)

Author: albertvillanova

datasets/arsentd_lev/README.md

@@ -5,7 +5,7 @@ language_creators:
 - found
 language:
 - apc
-- apj
+- ajp
 license:
 - other
 multilinguality:

datasets/bible_para/README.md

@@ -50,8 +50,8 @@ language:
 - id
 - is
 - it
+- ja
 - jak
-- jap
 - jiv
 - kab
 - kbh

datasets/open_subtitles/README.md

@@ -61,7 +61,6 @@ language:
 - uk
 - ur
 - vi
-- ze
 - zh
 language_bcp47:
 - pt-BR
@@ -141,7 +140,69 @@ E.g.
 
 ### Languages
 
-[More Information Needed]
+The languages in the dataset are:
+- af
+- ar
+- bg
+- bn
+- br
+- bs
+- ca
+- cs
+- da
+- de
+- el
+- en
+- eo
+- es
+- et
+- eu
+- fa
+- fi
+- fr
+- gl
+- he
+- hi
+- hr
+- hu
+- hy
+- id
+- is
+- it
+- ja
+- ka
+- kk
+- ko
+- lt
+- lv
+- mk
+- ml
+- ms
+- nl
+- no
+- pl
+- pt
+- pt_br: Portuguese (Brazil) (pt-BR)
+- ro
+- ru
+- si
+- sk
+- sl
+- sq
+- sr
+- sv
+- ta
+- te
+- th
+- tl
+- tr
+- uk
+- ur
+- vi
+- ze_en: English constituent of Bilingual Chinese-English (subtitles displaying two languages at once, one per line)
+- ze_zh: Chinese constituent of Bilingual Chinese-English (subtitles displaying two languages at once, one per line)
+- zh_cn: Simplified Chinese (zh-CN, `zh-Hans`)
+- zh_tw: Traditional Chinese (zh-TW, `zh-Hant`)
 
 ## Dataset Structure