Map [Enter] key to modal/form submit

[ghost]

While the [Esc] key is automatically mapped to dismiss a modal, the [Enter] key does not automatically equate to a "submit" or similar button press in various Vorto forms and modals.

Similarly (but less importantly maybe), while keyboard shortcuts for buttons (first letter underlined) are commonplace and desirable in a desktop application, they could also be added to Vorto, thus enhancing keyboard-based navigation.