expose translations object or add exists method on Translator

[Jonoh89]

Currently the translator will return the key if the translation does now exist, this is not a good enough check for existence as the translation could potentially be equal to the key. I need this to show a default message if an error from a server is not recognised.

We should allow direct access to the resources through the Translator singleton or add an existence method.

[ahumphreys87]

@Jonoh89 interested in adding a PR for this. Im 👍 for it as a feature, a hasTranslation method could work