Hello,
Let me start by saying that your plugin is very useful. It was a great help to find untranslated strings.
I've used your plugin and it was working fine until it added two lines like the following to en.yml file:
long_ordinal: !ruby/object:Proc {}
Note: I'm using Rails 2.3.2

Hi,

If I run :

$ rake translate:google FROM=en TO=de rake aborted!
uninitialized constant GoogleApi::HTTParty

I had to add a require 'httparty' at begining of tasks/translate.rake

Some people have jquery instead of prototype in their default sources but this plugin works isolated from the application environment so it could be helpful to provide a way to load prototype when it's not in the default sources.

I uploaded a patch in the next gist to load prototype from google apis when it's not present in the default sources:

http://gist.github.com/258632