Add support for actually using Gettext in Annotator.

(For now, only with customized English text.)

h/js/host.coffee

@@ -17,6 +17,7 @@ class Annotator.Host extends Annotator
     tick: false
 
   constructor: (element, options) ->
+    Gettext.prototype.parse_locale_data annotator_locale_data    
     super
 
     @app = @options.app

h/js/services.coffee

@@ -52,6 +52,7 @@ class Hypothesis extends Annotator
 
   this.$inject = ['$document', '$location', '$rootScope', '$route', 'drafts']
   constructor: ($document, $location, $rootScope, $route, drafts) ->
+    Gettext.prototype.parse_locale_data annotator_locale_data
     super ($document.find 'body')
 
     # Load plugins