Extension:Translate/translate metadata table

mysql> describe translate_metadata;
+-----------+----------------+------+-----+---------+-------+
| Field     | Type           | Null | Key | Default | Extra |
+-----------+----------------+------+-----+---------+-------+
| tmd_group | varbinary(200) | NO   | PRI | NULL    |       |
| tmd_key   | varbinary(20)  | NO   | PRI | NULL    |       |
| tmd_value | mediumblob     | NO   |     | NULL    |       |
+-----------+----------------+------+-----+---------+-------+