Good points.
I've updated my post above with an ALTER TABLE for auto-increment and a note to choose a valid language before running it.

The ALTER TABLE query is based on the assumption that you're using MyISAM format for the MySQL table (since that's what Zen Cart uses for that table by default). If you've changed the schema to use InnoDB instead, you'll need to change the 1 to the desired number since InnoDB can't autocalculate the next value. One could use a max() calculation too, but there's no need since there's a 0.00001% chance this is even relevant.