Fix that escaped interpolations with reserved keywords raised ReservedInterpolationKey #688
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I found this issue when looking into fixing glebm/i18n-tasks#552. The reserved keywords in the interpolations were noticed due to #678. The proposed solution is to escape the interpolation with
%%
based on https://github.com/ruby-i18n/i18n/blob/master/lib/i18n/interpolate/ruby.rb.However, the check for reserved keywords didn't care that the interpolation was escaped. I adjusted the regex for the reserved keywords with the same negative lookbehind assertion as proposed in the i18n-tasks issue.