diff --git a/assets/javascripts/lib/i18n.coffee b/assets/javascripts/lib/i18n.coffee
new file mode 100644
index 00000000..a675ea3b
--- /dev/null
+++ b/assets/javascripts/lib/i18n.coffee
@@ -0,0 +1,17 @@
+class @I18n
+  constructor: (@data, lang = 'en') ->
+    @setLanguage lang
+
+  setLanguage: (lang) ->
+    return false unless @data[lang]
+    @lang = lang
+    true
+
+  _: (key, substitution) ->
+    str = @data[@lang][key]
+    return unless str?
+
+    if substitution?
+      for key in Object.keys(substitution)
+        str = str.replace("{#{key}}", substitution[key])
+    str