How to make a multi-shop by region on Open cart 1.5?

Question

opencart

The task was to create for the site, they are ready for subdomains, but here's how to implement it so that when you enter the site through Omsk in the goods, in the categories in the title and description there was the word buy in Omsk, order in Omsk, and so on, depending on the region, well, all content is the same so that only meta tags change. I would be grateful for links to the implementation of this issue