[FEATURE] Add label to base column to be used in column types

[offirgolan]

This puts label on the base column so it can be easily overwritten when defining new column types.

[HenryVonfire]

It worked like a charm with ember-intl 😄

export default Column.extend({
  intl: service(),
  label: computed('column.label', function () {
    return this.get('intl').findTranslationByKey(this.get('column.label'));
  })
});