Version 3.3.9

• Show an alert whenever the learner leaves the lesson page in the middle of a lesson.
• Make review opportunities load faster on the translation review page.
• Fix a bug where images in translation suggestions do not show up for reviewers.
• Fix a bug where skills were not able to be added to the diagnostic test in a topic.
• Prevent saving video rich-text components if the parameters for them are not correctly specified.
• Fix a bug where an error in connecting to our Mailchimp mailing list was resulting in sign-ups failing.
• Fix a bug where the text input field loses focus each time the user adds a response option to a question.