After upgrade from 1.8.7 to 1.9.3, some YAML data treated as binary

[crowbot]

This has caused errors on the macedonian site:

An Encoding::CompatibilityError occurred in user#signin:

incompatible character encodings: ASCII-8BIT and UTF-8
lib/i18n_fixes.rb:34:in `gsub'

When interpolating post_redirect.reason_params[:web] which has been serialised via YAML.

Seems like the issue described as "Deep deep YAML oddness" in https://www.zendesk.com/blog/upgrade-the-road-to-1-9/.
Looking at the code, I see we port the problematic method in question to ruby 1.9. Not sure if that's still needed.

[crowbot]

Fixed in f75b1de