Add intl polyfill for Safari 9

Update Stage Select UI

chore(package): update scratch-blocks to version 0.1.0-prerelease.153…

- Make stage look more like a tile element and not flust with the stage info width.
- Make the stage select state more apparent

Update scratch-paint to the latest version 

Closes #2602

Issue/2514 extension lang switch

Change "how-to" messages to "tutorial" and update the icon to lightbulb

Stop block drag surface from stopping mouse enter events

Handle mouseUp on language select for firefox

Update to newest scratch-vm

Use a larger icon image for the device connection flow

Update scratch-paint to the latest version 

Fix device status indicator updating issues

Handle localized library strings for Analytics

The onMouseUp handler for the menu rerenders the language menu before the select onChange function runs on Firefox. So it resets the language value back to the previous value and the locale doesn’t update. If the languageMenu isopen don’t fire the openlanguageMenu action.

Update scratch-paint to the latest version 

Initial version of device connection modals

Depends on https://github.com/LLK/scratch-vm/pull/1321

Update 'mini cards' color UI

Swap order of “start sound” and “play sound until done”

Update translate extension library tile image