Fix: support cross language for API. (#8946)

### What problem does this PR solve?

Close #8943

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

docs/references/http_api_reference.md

@@ -1725,6 +1725,7 @@ Retrieves chunks from specified datasets.
   - `"rerank_id"`: `string`  
   - `"keyword"`: `boolean`  
   - `"highlight"`: `boolean`
+  - `"cross_languages"`: `list[string]`  
 
 ##### Request example
 
@@ -1769,6 +1770,8 @@ curl --request POST \
   Specifies whether to enable highlighting of matched terms in the results:  
   - `true`: Enable highlighting of matched terms.
   - `false`: Disable highlighting of matched terms (default).
+- `"cross_languages"`: (*Body parameter*) `list[string]`  
+  The languages that should be translated into, in order to achieve keywords retrievals in different languages.
 
 #### Response
 

docs/references/python_api_reference.md

@@ -953,6 +953,10 @@ Specifies whether to enable highlighting of matched terms in the results:
 - `True`: Enable highlighting of matched terms.
 - `False`: Disable highlighting of matched terms (default).
 
+##### cross_languages:  `list[string]`  
+
+The languages that should be translated into, in order to achieve keywords retrievals in different languages.
+
 #### Returns
 
 - Success: A list of `Chunk` objects representing the document chunks.