* mark string as html safe before passing to translation instead of bypassing HTML escape using {{{unsafe}}} syntax
* replace ember-i18n with ember-intl
Ember Bootstrap has changed a lot since the very outdated pre 1.0 release
which was used here. Changes are mostly about using composable components
and closure actions.
Also replaces PhantomJS with Chrome in CI cause PhantomJS is also very
outdated and causing test failure not related to any real world issues.
Ember CLI has replaced PhantomJS with Chrome in v2.15.1, which is the
upfollowing minor release to the version currently used.
There might be use cases and it simplifies validation a lot.
Also fixes this missing translation message mentioned in #84:
> /create/options-datetime: There isn't any validation error shown when validation fails due to not enough times.
