Fix regression when passing a value different of String.

The previous version of rails(4.2.0) you can pass objects
to the default option of translation helper.

For example:

```ruby
  t('foo', default: 1)
```

But on rails 4.2.1 version this kind of use stopped to work,
because started only to accept String types.

Now with this fix we can use orther value types on this
helper again.

1 files changed, 5 insertions, 1 deletions

diff --git a/actionview/lib/action_view/helpers/translation_helper.rb b/actionview/lib/action_view/helpers/translation_helper.rb
index 342361217c..24b633c5bb 100644
--- a/actionview/lib/action_view/helpers/translation_helper.rb
+++ b/actionview/lib/action_view/helpers/translation_helper.rb
@@ -37,8 +37,12 @@ module ActionView
       # you know what kind of output to expect when you call translate in a template.
       def translate(key, options = {})
         options = options.dup
+        has_default = options.has_key?(:default)
         remaining_defaults = Array(options.delete(:default))
-        options[:default] = remaining_defaults.shift if remaining_defaults.first.kind_of? String
+
+        if has_default && !remaining_defaults.first.kind_of?(Symbol)
+          options[:default] = remaining_defaults.shift
+        end
 
         # If the user has explicitly decided to NOT raise errors, pass that option to I18n.
         # Otherwise, tell I18n to raise an exception, which we rescue further in this method.