improve(i18n): add locales for content.json, add code for server to i18n, build

script/i18n.coffee

@@ -1,11 +1,22 @@
 _ = require 'lodash'
 
 module.exports = 
-  strings: {}
-  t: (stringName, vars) ->
-    string = module.exports.strings[stringName]
+  strings: {}, # Strings for one single language
+  translations: {} # Strings for multiple languages {en: strings, de: strings, ...}
+  t: (stringName) -> # Other parameters allowed are vars (Object) and locale (String)
+    vars = arguments[1]
+
+    if _.isString(arguments[1])
+      vars = null
+      locale = arguments[1]
+    else if arguments[2]?
+      vars = arguments[1]
+      locale = arguments[2]
+
+    string = if locale then module.exports.translations[locale][stringName] else module.exports.strings[stringName]
 
     if string
       if vars then _.template(string, vars) else string
     else
-      _.template(module.exports.strings.stringNotFound, {string: stringName})
+      stringNotFound = if locale then module.exports.translations[locale].stringNotFound else module.exports.strings.stringNotFound
+      _.template(stringNotFound, {string: stringName})