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
Why this change? We have been bitten by bugs where tests are not catching missing interpolate argument in our client side code because the JavaScript tests are also using `I18n.translate` to assert that the right message is shown. Before this change, `I18n.interpolate` will just replace the missing interpolation argument in the final translation with some placeholder. As a result, we ended up comparing a broken translation with another broken translation in the test environment. Why does this change do? This change introduces the `I18n.testing` property which when set to `true` will cause `I18n.translate` to throw an error when an interpolate argument is missing. With this commit, we also set `I18n.testing = true` when running qunit acceptance test.