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cc @jetrunner
Co-Authored-By: Kevin Canwen Xu <canwenxu@outlook.com>

cc @tholor

see #2799

* add readme for bert-base-german-cased

* update readme

Add option to `cached_path` to automatically extract archives

Changed vocabulary save function. Variable name was inconsistent, causing an error to be thrown when passing a file name instead of a directory.

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* Arxiv README

* ArXiv-NLP readme

cc @lysandrejik @thomwolf

This prevents the model from being saved, and who knows
what else.

see 1ebfeb79

 and #2728
Co-Authored-By: Lysandre Debut <lysandre.debut@reseau.eseo.fr>

* pass langs parameter to certain XLM models

Adding an argument that specifies the language the SQuAD dataset is in so language-sensitive XLMs (e.g. `xlm-mlm-tlm-xnli15-1024`) don't default to language `0`.
Allows resolution of issue #1799 .

* fixing from `make style`

* fixing style (again)