Drops ember-radio-buttons addon and uses a plain input element instead. ember-radio-buttons doesn't seem to be maintained anymore and required jQuery. Also plain input element seems to be much easier to maintain.
Replaces ember-ajax by ember-fetch as ember-ajax is build on top of jQuery.ajax().
This reduces the bundle size by 25 KB (JavaScript) after gzip. Updating the size limit accordingly.
* upgraded ember-moment and use it application-wide service to set locale
* label on poll/participation now observes locale changes, but it's still hacky
* replace computed property on views poll by moment-format helper of ember-moment
