Set wikipedia lang (#1515)

### What problem does this PR solve?



### Type of change

- [x] New Feature (non-breaking change which adds functionality)

graph/component/wikipedia.py

@@ -30,9 +30,16 @@ class WikipediaParam(ComponentParamBase):
     def __init__(self):
         super().__init__()
         self.top_n = 10
+        self.lang = 'en'
 
     def check(self):
         self.check_positive_integer(self.top_n, "Top N")
+        self.check_valid_value(self.lang, "Wikipedia languages",
+                               ['af', 'pl', 'ar', 'ast', 'az', 'bg', 'nan', 'bn', 'be', 'ca', 'cs', 'cy', 'da', 'de',
+                                'et', 'el', 'en', 'es', 'eo', 'eu', 'fa', 'fr', 'gl', 'ko', 'hy', 'hi', 'hr', 'id',
+                                'it', 'he', 'ka', 'lld', 'la', 'lv', 'lt', 'hu', 'mk', 'arz', 'ms', 'min', 'my', 'nl',
+                                'ja', 'nb', 'nn', 'ce', 'uz', 'pt', 'kk', 'ro', 'ru', 'ceb', 'sk', 'sl', 'sr', 'sh',
+                                'fi', 'sv', 'ta', 'tt', 'th', 'tg', 'azb', 'tr', 'uk', 'ur', 'vi', 'war', 'zh', 'yue'])
 
 
 class Wikipedia(ComponentBase, ABC):
@@ -45,9 +52,11 @@ class Wikipedia(ComponentBase, ABC):
             return Wikipedia.be_output(self._param.no)
 
         wiki_res = []
-        for wiki_key in wikipedia.search(ans, results=self._param.top_n):
+        wikipedia.set_lang(self._param.lang)
+        wiki_engine = wikipedia
+        for wiki_key in wiki_engine.search(ans, results=self._param.top_n):
             try:
-                page = wikipedia.page(title=wiki_key, auto_suggest=False)
+                page = wiki_engine.page(title=wiki_key, auto_suggest=False)
                 wiki_res.append({"content": '<a href="' + page.url + '">' + page.title + '</a> ' + page.summary})
             except Exception as e:
                 print(e)