Use Drupal translation system

Sorry, don't have time for proper patch. This works for me, generally. The only problem is with proper translation of plural values. We don't have count, cause the string is completely processed by the plupload JS, so we can't use Drupal.formatPlural(). It would be great to somehow make it work without forking.

Drupal.behaviors.pluploadBuild = function (context) {
	// Add translations.
	plupload.addI18n({
	  'Select files' : Drupal.t('Select files'),
	  'Add files to the upload queue and click the start button.' : Drupal.t('Add files to the upload queue and click the start button.'),
	  'Filename' : Drupal.t('Filename'),
	  'Status' : Drupal.t('Status'),
	  'Size' : Drupal.t('Size'),
	  'Add files' : Drupal.t('Add files'),
	  'Stop current upload' : Drupal.t('Stop current upload'),
	  'Start uploading queue' : Drupal.t('Start uploading queue'),
	  'Uploaded %d/%d files': Drupal.t('Uploaded %d/%d files'),
	  'N/A' : Drupal.t('N/A'),
	  'Drag files here.' : Drupal.t('Drag files here.'),
	  'File extension error.': Drupal.t('File extension error.'),
	  'File size error.': Drupal.t('File size error.'),
	  'Init error.': Drupal.t('Init error.'),
	  'HTTP Error.': Drupal.t('HTTP Error.'),
	  'Security error.': Drupal.t('Security error.'),
	  'Generic error.': Drupal.t('Generic error.'),
	  'IO error.': Drupal.t('IO error.'),
	  'Start upload' : Drupal.t('Start upload'),
	  'Stop upload' : Drupal.t('Stop upload'),
	  '%d files queued' : Drupal.t('%d files queued'),
	  // These seems to be wrong based on a comment on plupload forums.
	  // But they won't do any harm either.
	  'Add Files' : Drupal.t('Add files'),
	  'Start Upload' : Drupal.t('Start upload'),
	  'Stop Upload' : Drupal.t('Stop upload')
	});

       // ... the rest ...
}