Announcing release v3.3.6 of Oppia!

[Kevin Thomas]

Hi Oppia Devs,

I'm glad to announce that v3.3.6 is now live at Oppia.org. Here is a quick summary of the changes based on user categories:

• Learners:

1. Add hints to embedded lessons.

• Contributors:

1. Send email notifications about new suggestions to translation reviewers.

2. Allow translation reviewers to view the context of a translation in the exploration translation tab with a single click.

• Creators

1. Fix a bug that prevented hints and solutions showing up in the exploration editor preview tab.

2. Make it easier to add skill concept cards to rich-text editor fields in the exploration editor.

Feel free to look at the complete list of changes here: https://github.com/oppia/oppia/commits/release-3.3.6
Huge thanks to the release testers -- Yash, Pritam, Mohd Afzal Khan, Hardik Goyal, Sagar Subedi, Shubhadeep Karmakar, Jay Vivarekar, Praful Bandre -- and to the QA coordinator, Kanupriya Gupta.
Thanks, Kevin (on behalf of the release team)