This way one can still get the benefits of the GUI container but have a custom collection of components within it.

This shouldn't be required.

This way a stage is not necessary for sound blocks to work

Added language-selector component and container. Replaced lib/intl.jsx with reducers/intl.js and added updateIntl to handle language changes.

Moved languages.json into src

Keep localization in the container level. Ideally we should not be passing message descriptors.