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

@@ -1,15 +1,26 @@
----
-license: mit
-tags:
-- unsloth
-- trl
-- grpo
-datasets:
-- openai/gsm8k
-language:
-- en
-- zh
-base_model:
-- Qwen/Qwen2.5-3B-Instruct
----
-https://colab.research.google.com/github/unslothai/notebooks/blob/main/nb/Qwen2.5_(3B)-GRPO.ipynb
+---
+license: mit
+tags:
+- unsloth
+- trl
+- grpo
+datasets:
+- openai/gsm8k
+language:
+- zho
+- eng
+- fra
+- spa
+- por
+- deu
+- ita
+- rus
+- jpn
+- kor
+- vie
+- tha
+- ara
+base_model:
+- Qwen/Qwen2.5-3B-Instruct
+---
+https://colab.research.google.com/github/unslothai/notebooks/blob/main/nb/Qwen2.5_(3B)-GRPO.ipynb