Hi there,
I’ve checked the footer of the site and the parts in Arabic are typed-in manually using blocks.
I’m not sure if WPML can translate strings that are user-added. You may have to ask if they have a feature to translate user-added contents.
But to help out:
You can try getting a plugins like contextual widgets so you can set conditions on widget area blocks. This way you can place multiple widgets (one for english, another for arabic) w/ conditions so the widget display differently depending on what language the user uses.