Add `?locale=<localecode>` to load in a new langage.
Add `?enable=language` to enable the language selector
Or combine the two: `?enable=language&locale=<localecode>`
Still accepts a hash, but requires that the hash be a sequence of digits.

Added new locales reducer to gui:
- initializes default  react-intl/localeData
- initializes default locale messages for all locales
- default locale is ‘en’ (can be overridden by URL)

Removed dependency on react-intl-redux, added ConnectedIntlProvider (uses correct locale messages from redux based on current locale)

Sharing costumes and sounds to other sprites and the stage

Update scratch vm to include sharing APIs

Update scratch-paint to the latest version 

Update scratch-svg-renderer to the latest version 

Backpack load contents from server

Close issues automatically

Thanks @niccokunzmann!

Update scratch-blocks to the latest version 

Update scratch-audio to the latest version 

Update scratch-render to the latest version 

Force new active index and value after hitting the remove button.

Enable comments.

Update scratch-blocks to the latest version 

Problem: Some issues are kept open after the pull request is merged
Solution: Add a "resolves" to the issue template so they are closed by default.
https://help.github.com/articles/closing-issues-using-keywords/

chore(package): update scratch-blocks to version 0.1.0-prerelease.152…

Closes #2362

Disable comments

Fixes https://github.com/LLK/scratch-gui/issues/2361

Update scratch-render to the latest version