Add Open Graph metadata to the HTML5 editor
Add Open Graph metadata to the HTML5 editor

- Consistently use double quotes in the HTML markup.
- Define English language to assist screen readers and search engines.
- Add missing `alt` text for the logo image.
- Remove duplicate `id` for the preload project ZIP input.

(cherry picked from commit 197d391f084f669362316e87f66f2c79ef4178bf)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot