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 +1,27 @@
----
-license: apache-2.0
-datasets:
-- GX-XinGao/GRA
-language:
-- en
-metrics:
-- accuracy
-base_model:
-- Qwen/Qwen2.5-7B
-pipeline_tag: text-generation
----
-Paper: [A Strategic Coordination Framework of Small LLMs Matches Large LLMs in Data Synthesis](arxiv.org/abs/2504.12322)
-
+---
+license: apache-2.0
+datasets:
+- GX-XinGao/GRA
+language:
+- zho
+- eng
+- fra
+- spa
+- por
+- deu
+- ita
+- rus
+- jpn
+- kor
+- vie
+- tha
+- ara
+metrics:
+- accuracy
+base_model:
+- Qwen/Qwen2.5-7B
+pipeline_tag: text-generation
+---
+Paper: [A Strategic Coordination Framework of Small LLMs Matches Large LLMs in Data Synthesis](arxiv.org/abs/2504.12322)
+
 Code: https://github.com/GX-XinGao/GRA