Add the {{pluralize}} helper in Ember Handlebars templates.

ember.handlebars.pluralize.js

// Register the pluralize helper.
Ember.Handlebars.registerBoundHelper( 'pluralize', function( number, options ) {
    var phraseMatch = ( options.hash.phrase || '{|s}' ).match( /(.*?)\{(.*?)\|(.*?)\}/ )
    Ember.assert( 'The optional "phrase" hash for {{pluralize}} should be formatted as <phrase to pluralize>{<singular ending>|<plural ending>}', phraseMatch )
    var word = phraseMatch[ 1 ],
        singular = word + phraseMatch[ 2 ],
        plural = word + phraseMatch[ 3 ]
    return number == 1 ? singular : plural
})

template.handlebars

{{!
  Basic usage
}}

{{ bananas_count }} banana{{ pluralize bananas_count }} in the bunch.

Singular: 1 banana in the bunch.
Plural: 5 bananas in the bunch.


{{!
  Phrase usage
  The syntax used for the "phrase" option is
  <phrase to pluralize>{<singular ending>|<plural ending>}
}}

The {{ pluralize bananas_count phrase="banana{ is|s are}" }} on the table.

Singular: The banana is on the table.
Plural: The bananas are on the table.