Lost-in-translation is a project mainly written in Ruby, it's free.
Tool to help manage i18n translation strings in ruby/rails projects.
WARNING: the core logic has been implemented but this is not usable just yet.
Lost in translation is a tool to help you manage your i18n translation strings in your ruby/rails projects.
It's still under heavy development but it currently implements a function that finds the translation strings of your locale files that are not used anymore.
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Lost in translations parses your ruby and erb files into an abstract syntax tree and finds all the calls to the 'translate' method inside your code. It is not perfect, but it generally works better than a regexp-based approach.
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i18n ruby_parser erubis
actionview (optional but makes it work better with Rails)