Improved user experience of how Summary Fields are managed. They're now listed out vertically and sortable.
Added French translation. Thank you, Cyrille Sanson!
Fixed typo in :sum modifier merge tag default value.
Updated custom template names to have precedence before all standard template names.
Updated docblock with variables in nested-entries-all.php.
Added new GP_Nested_Forms::get_template_names() method and updated instances where we specified template names manually to use this new helper method.
