New features

The first alpha release for the multi-lingual branch.

As much as this is an Alpha release, I only speak one language so it's actually pretty dev.

Updating permissions

Add group memberships

Changes since 7.x-2.0-beta6:

small, yet important enhancement, sending order and payment ids (as invoice and transaction IDs), for a better order/payment management

#3019289: Send the order ID as merchantInvoiceId

First full release provides simple in-page prev/next navigation with 2 theme options.