Rename 501.Find-Mode-in-Binary-Search-Tree.md to 501.Find-Mode-in-Binary-Search-Tree-en.md

Author: azl397985856

problems/501.Find-Mode-in-Binary-Search-Tree.md renamed to problems/501.Find-Mode-in-Binary-Search-Tree-en.md

@@ -86,4 +86,4 @@ class Solution {
         helper(root.right);
     }
 }
-```
+```