Additional Images - MS2 Updated

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Base on last previous works, I make change to catalog/admin/categories.php 
(also .../english/categories.php). This main change apply due to "upload class" 
provided by MS2. It's also will check is "medium_images" field is empty or not.

So, if you have last version of Toby works installed on your OsC and want to 
use "upload class", you only need modify catalog/admin/categories.php and adding
some languages define to admin/includes/languages/english/categories.php; Otherwise, 
please disregards this update.

I also add "KEY products_id (products_id)" to table "additional_images"