Street fields in checkout don't have a label that's readable by a screenreader

[TomFranssen]

Preconditions

1. Standard Magento ver. 2.1.7 installation

Steps to reproduce

1. Add a product to your cart
2. Go to checkout
3. The address lines input fields don't have a <label> element with a valid value. There is a <span> infront of it with the text 'Address'. This text however doesn't get recognised by screen readers.

Expected result

1. The labels should have a valid <label> element that is linked to the <input> field with a for attribute. My advice is to add linked elements to all the address line fields so that screen readers can know what kind of fields the address fields are and thus increasing accessibility.

If I test this on the default MAC screenreader (activated by CMD + F5) I get the feedback of: 'edit text blank'. In this situation the visually impaired user doesn't get feedback on what type of field it is.

[pboisvert]

duplicate of #10893