Return SKU and title in product autocomplete

Problem/Motivation

When using commerce_product_reference widget, autocomplete return @sku: @title as label, but only sku as title. So after selecting product in list, only sku is displayed in field.

This is not user-friendly, and contributors should see both sku and product title.

Currently:

Expected:

Proposed resolution

commerce_product_reference use drupal_explode_tags() on values to get skus, which can retrieve sku if it's surrounded by quotation marks.
So i suggest commerce_product_autocomplete() to return "@sku": @title instead of $data['rendered'] containing @sku: $title

User interface changes

Display "@sku": @title in product reference field instead of only skus.