Use fakeredis for tests
Convert all translation input into valid UTF-8

Unfortunately, this introduced chattiness in the test suite.
Something is printing "error : string is not in UTF-8" to
STDOUT during feature specs around cp1252 encoded input. I suspect
it's one of the test gems.
Fix typo in spec description
Merge pull request #5 from g5search/prevent_invalid_encodings

Convert all translation input to UTF-8