diff --git a/app/assets/javascripts/darkswarm/i18n.js.coffee b/app/assets/javascripts/darkswarm/i18n.js.coffee
index 857437a51d..15ee584400 100644
--- a/app/assets/javascripts/darkswarm/i18n.js.coffee
+++ b/app/assets/javascripts/darkswarm/i18n.js.coffee
@@ -1,12 +1,13 @@
 # Declares the translation function t.
 # You can use t('login') in Javascript.
 window.t = (key, options = {}) ->
-  if I18n == undefined
+  unless 'I18n' of window
     console.log 'The I18n object is undefined. Cannot translate text.'
     return key
+  return key unless key of I18n
   text = I18n[key]
-  return key if text == undefined
-  text = text.split("%{#{name}}").join(value) for name, value of options
+  for name, value of options
+    text = text.split("%{#{name}}").join(value)
   text
 
 # Provides the translation function t on all scopes.