* Core POC support for polymer i18n
* Move translation from core.js to html
* Replace fetch with XHR
* Convert translation pipeline to gulp
* Convert from polyglot to Polymer localize
* Pass through missing keys for custom panels
* Store promise to be reused
* Use cacheFirst sw handler for translations
* Write full filenames to translationFingerprints
* Precache en translation
* Convert home-assistant-main to ES6 class
* Create a localization mixin
* Cleanup
* Add polymer tags to annotate for linter
* Rename fingerprints to translationMetadata
* Build translation native names into metadata
* Add language selection UI to sidebar
* Provide separate message namespace argument
* Store language/resources on hass object
* Store translationMetadata on hass
* Move language selector to config panel
* Temporarily hide language selector
* Small cleanups
* Use dynamic-align for more flexible layout
* Migrate to fetch API
* Only send change events for user selection events
* Update for new linting rules
* Migrate build_frontend changes
