create a new renderer instance on calls to `for`
This changes the renderer class to store the controller and defaults as an instance variable rather than allocating a new class. You can create a new renderer with an new env by calling `Renderer#new` or use new defaults by calling `Renderer#with_defaults` and saving the return value somewhere. Also I want to keep the `env` private since I would like to change the keys in the future. This commit only translates particular keys that the user requested.
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