enhance: [2.5] use english name as language name for all type language identifier (#42601)

Set whatlang detect return language name as english name.
Make sure same with lingua. 
pr: https://github.com/milvus-io/milvus/pull/42600

Signed-off-by: aoiasd <zhicheng.yue@zilliz.com>

internal/core/thirdparty/tantivy/tantivy-binding/src/analyzer/tokenizers/lang_ident_tokenizer.rs

@@ -36,7 +36,7 @@ impl Identifier for WhatlangIdentifier {
         detect(text)
             .map_or("default", |info| {
                 if info.confidence() > self.confidence {
-                    info.lang().code()
+                    info.lang().eng_name()
                 } else {
                     "default"
                 }