アイヌ語追加 (#428) (#433)

Reviewed-on: #433
Co-authored-by: miteruzo <miteruzo@naver.com>

frontend/src/pages/posts/PostHistoryPage.test.tsx

@@ -47,10 +47,10 @@ describe ('PostHistoryPage', () => {
         externalTag: '7',
         page:        1,
         limit:       20,
-      })
+      }, 'ja')
     })
 
-    expect (tagsApi.fetchExternalTag).toHaveBeenCalledWith ('7')
+    expect (tagsApi.fetchExternalTag).toHaveBeenCalledWith ('7', 'ja')
     expect (tagsApi.fetchTag).not.toHaveBeenCalled ()
 
     expect (