As an instructional designer
I want to edit existing H5P in the content bank
So that I can improve, update or fix existing H5P content in the site

Acceptance criteria:

• Be able to access H5P editor via content bank to change existing H5P content.

List of tasks:

• Define information wokflow between content bank and H5P content editor to fill the editor with existing content.
• Implement needed classes, method and functions to edit existing H5P content.
• Add new PHP Unit tests
• Add behat tests or create a new issue to add them