Removing prototypal i18n code

refs #16, #17, #18, #19, #20, #21, TryGhost#3801

- This code was a prototype system built when Ghost was still a prototype.
  It was never fully implemented and hasn't actually worked for ages.
- Now that the admin is in Ember, it's likely we'll need a very different
  system.

core/server/helpers/index.js

@@ -1,7 +1,6 @@
 var downsize        = require('downsize'),
     hbs             = require('express-hbs'),
     moment          = require('moment'),
-    polyglot        = require('node-polyglot').instance,
     _               = require('lodash'),
     when            = require('when'),
 
@@ -569,32 +568,6 @@ coreHelpers.meta_description = function (options) {
     });
 };
 
-/**
- * Localised string helpers
- *
- * @param {String} key
- * @param {String} default translation
- * @param {Object} options
- * @return {String} A correctly internationalised string
- */
-coreHelpers.e = function (key, defaultString, options) {
-    var output;
-    return when.all([
-        api.settings.read('defaultLang'),
-        api.settings.read('forceI18n')
-    ]).then(function (values) {
-        if (values[0].settings[0] === 'en_US' &&
-                _.isEmpty(options.hash) &&
-                values[1].settings[0] !== 'true') {
-            output = defaultString;
-        } else {
-            output = polyglot.t(key, options.hash);
-        }
-
-        return output;
-    });
-};
-
 coreHelpers.foreach = function (context, options) {
     var fn = options.fn,
         inverse = options.inverse,

core/test/unit/server_helpers_index_spec.js

@@ -1368,43 +1368,6 @@ describe('Core Helpers', function () {
         });
     });
 
-    describe('e helper', function () {
-
-        it('is loaded', function () {
-            should.exist(handlebars.helpers.e);
-        });
-
-        it('should return the correct default string', function (done) {
-            apiStub.restore();
-            apiStub = sandbox.stub(api.settings, 'read', function () {
-                return when({ settings: ['en_US'] });
-            });
-
-            helpers.e('testKey', 'default', { hash: {} }).then(function (result) {
-                result.should.equal('default');
-                done();
-            }).catch(done);
-        });
-
-        it('should return the correct string', function (done) {
-            apiStub.restore();
-            apiStub = sandbox.stub(api.settings, 'read', function () {
-                return when({ settings: ['fr'] });
-            });
-
-            var polyglot = new Polyglot();
-
-            polyglot.extend({ testKey: 'test value' });
-
-            helpers.__set__('polyglot', polyglot);
-
-            helpers.e('testKey', 'default', { hash: {} }).then(function (result) {
-                result.should.equal('test value');
-                done();
-            }).catch(done);
-        });
-    });
-
     describe('foreach helper', function () {
 
         // passed into the foreach helper.  takes the input string along with the metadata about

package.json

@@ -50,7 +50,6 @@
         "lodash": "2.4.1",
         "moment": "2.4.0",
         "morgan": "1.0.0",
-        "node-polyglot": "0.3.0",
         "node-uuid": "1.4.1",
         "nodemailer": "0.5.13",
         "oauth2orize": "1.0.1",