Add utils.clone
Add a locales module
Add utils.memoize_hasher
Fix en_US.json
Add _.sprintf support to locales.string
Allow for flash.message to accept a promise to return a string
Localize existing calls to flash.message
Add locales.localize_dom_nodes.  Should this use the value of the
data-localize attribute (as it is currently), or the text content
of the node in question?