added chinese to languag epacks

docs/language-packs/index.md

@@ -20,6 +20,7 @@ Multiple packs can coexist — install as many as you need.
 |---|---|---|
 | Spanish | `es` | `pip install foreignthon-es` |
 | Tamil | `ta` | `pip install foreignthon-ta` |
+| Chineese | `zh` | `pip install foreignthon-zh` |
 
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