Improve language tag

Hi! As the model is multilingual, this is a PR to add other languages than English to the language tag to improve the referencing. Note that 29 languages are announced in the README, but only 13 are explicitly listed. I was therefore only able to add these 13 languages.

README.md

@@ -1,28 +1,42 @@
----
-library_name: transformers
-license: other
-base_model: Qwen/Qwen2.5-3B-Instruct
----
-
-<!-- This model card has been generated automatically according to the information the Trainer had access to. You
-should probably proofread and complete it, then remove this comment. -->
-
-# M-Prometheus
-
-M-Prometheus is a suite of open LLM judges that can natively evaluate multilingual outputs. They were trained on 480k instances of multilingual direct assessment and pairwise comparison data wiht long-form feedback. 
-They can be prompted in the same way as [Prometheus-2](https://huggingface.co/prometheus-eval/prometheus-7b-v2.0/tree/main).
-Check out our [paper](wip) for more details.
-
-## Citation
-
-```bibtex
-@misc{pombal2025mprometheussuiteopenmultilingual,
-      title={M-Prometheus: A Suite of Open Multilingual LLM Judges}, 
-      author={José Pombal and Dongkeun Yoon and Patrick Fernandes and Ian Wu and Seungone Kim and Ricardo Rei and Graham Neubig and André F. T. Martins},
-      year={2025},
-      eprint={2504.04953},
-      archivePrefix={arXiv},
-      primaryClass={cs.CL},
-      url={https://arxiv.org/abs/2504.04953}, 
-}
-```
+---
+library_name: transformers
+license: other
+base_model: Qwen/Qwen2.5-3B-Instruct
+language:
+- zho
+- eng
+- fra
+- spa
+- por
+- deu
+- ita
+- rus
+- jpn
+- kor
+- vie
+- tha
+- ara
+---
+
+<!-- This model card has been generated automatically according to the information the Trainer had access to. You
+should probably proofread and complete it, then remove this comment. -->
+
+# M-Prometheus
+
+M-Prometheus is a suite of open LLM judges that can natively evaluate multilingual outputs. They were trained on 480k instances of multilingual direct assessment and pairwise comparison data wiht long-form feedback. 
+They can be prompted in the same way as [Prometheus-2](https://huggingface.co/prometheus-eval/prometheus-7b-v2.0/tree/main).
+Check out our [paper](wip) for more details.
+
+## Citation
+
+```bibtex
+@misc{pombal2025mprometheussuiteopenmultilingual,
+      title={M-Prometheus: A Suite of Open Multilingual LLM Judges}, 
+      author={José Pombal and Dongkeun Yoon and Patrick Fernandes and Ian Wu and Seungone Kim and Ricardo Rei and Graham Neubig and André F. T. Martins},
+      year={2025},
+      eprint={2504.04953},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2504.04953}, 
+}
+```