We have published a pretty basic extension which solves an irritating issue for Magento 2 users.

For popup login in Magento 2, this extension replaces strings "Checkout out as a new customer" and "Checkout out using your account" with "Checkout as a new customer" and "Checkout using your account" respectively.

This is such a small issues that it should have been fixed in magento long ago, but unfortunately it still persists from Magento 2.0 till Magento 2.2.3.

More details on Github.

More details of Multivendor Marketplace for Magento 2 can be found here.