i18n: Fix user search in issue assginee select box

Currently, only Korean name is avaliable for search.
Search by English name is needed.
This commit will fix it.

app/controllers/api/IssueApi.java

@@ -360,6 +360,7 @@ private static ExpressionList<User> getUserExpressionList(String query, String s
         } else {
             el.icontains("loginId", query);
             el.icontains("name", query);
+            el.icontains("englishName", query);
             el.endJunction();
         }
         return el;