[model_cards] Switch all languages codes to ISO-639-{1,2,3}

model_cards/DeepPavlov/bert-base-bg-cs-pl-ru-cased/README.md

 ---
 language:
-- bulgarian
-- czech
-- polish
-- russian
+- bg
+- cs
+- pl
+- ru
 ---
 
 # bert-base-bg-cs-pl-ru-cased

model_cards/DeepPavlov/bert-base-cased-conversational/README.md

 ---
-language:
-- english
+language: en
 ---
 
 # bert-base-cased-conversational

model_cards/DeepPavlov/rubert-base-cased-conversational/README.md

 ---
 language:
-- russian
+- ru
 ---
 
 # rubert-base-cased-conversational

model_cards/DeepPavlov/rubert-base-cased-sentence/README.md

 ---
 language:
-- russian
+- ru
 ---
 
 # rubert-base-cased-sentence

model_cards/DeepPavlov/rubert-base-cased/README.md

 ---
 language:
-- russian
+- ru
 ---
 
 # rubert-base-cased

model_cards/KB/albert-base-swedish-cased-alpha/README.md

 ---
-language: swedish
+language: sv
 ---
 
 # Swedish BERT Models

model_cards/KB/bert-base-swedish-cased-ner/README.md

 ---
-language: swedish
+language: sv
 ---
 
 # Swedish BERT Models

model_cards/KB/bert-base-swedish-cased/README.md

 ---
-language: swedish
+language: sv
 ---
 
 # Swedish BERT Models

model_cards/LorenzoDeMattei/GePpeTto/README.md

 ---
-language: italian
+language: it
 ---
 
 # GePpeTto GPT2 Model 🇮🇹

model_cards/MoseliMotsoehli/TswanaBert/README.md

 ---
-language: setswana
+language: tn
 ---
 
 # TswanaBert

model_cards/MoseliMotsoehli/zuBERTa/README.md

 ---
-language: zulu
+language: zu
 ---
 
 # zuBERTa

model_cards/Musixmatch/umberto-commoncrawl-cased-v1/README.md

 ---
-language: italian
+language: it
 ---
 
 # UmBERTo Commoncrawl Cased

model_cards/Musixmatch/umberto-wikipedia-uncased-v1/README.md

 ---
-language: italian
+language: it
 ---
 
 # UmBERTo Wikipedia Uncased

model_cards/Norod78/hewiki-articles-distilGPT2py-il/README.md

 ---
-language: hebrew
-tags:
-- pytorch 
-- tf 
-- gpt2 
-- lm-head 
-- causal-lm 
-- pipeline:text-generation 
+language: he
 
 thumbnail: https://avatars1.githubusercontent.com/u/3617152?norod.jpg
 widget:

model_cards/Tereveni-AI/gpt2-124M-uk-fiction/README.md

 ---
-language: ukrainian
+language: uk
 ---
 
 Note: **default code snippet above won't work** because we are using `AlbertTokenizer` with `GPT2LMHeadModel`, see [issue](https://github.com/huggingface/transformers/issues/4285).

model_cards/TurkuNLP/bert-base-finnish-cased-v1/README.md

 ---
-language: finnish
+language: fi
 ---
 
 ## Quickstart

model_cards/TurkuNLP/bert-base-finnish-uncased-v1/README.md

 ---
-language: finnish
+language: fi
 ---
 
 ## Quickstart

model_cards/ViktorAlm/electra-base-norwegian-uncased-discriminator/README.md

 ---
-language: norwegian
+language: no
 thumbnail: https://i.imgur.com/QqSEC5I.png
 ---
 

model_cards/allegro/herbert-klej-cased-tokenizer-v1/README.md

 ---
-language: polish
+language: pl
 ---
 
 # HerBERT tokenizer

model_cards/allegro/herbert-klej-cased-v1/README.md

 ---
-language: polish
+language: pl
 ---
 
 # HerBERT