OpenCart 3.0 supports the multilingual SEO URLs! Whatever is the main language of your store, you can use it for the website links.
SEO Keyword is now moved to the SEO tab in the category editing field:
That’s the keyword that will be used for SEO URL addresses.
Same way, in products the SEO keyword is moved to a separate SEO tab.
You can assign SEO links to products, just like to the categories.