Log Message:
Update ruby-i18n to 0.8.1

v0.8.1							2017/02/22

* This release fixes an issue with I18n.transliterate and Chinese
  characters. See #362 for more information.

v0.8.0							2017/01/31

Notable changes

* You can now set I18n.cache_key_digest to determine how cache keys are
  calculated. If you were seeing issues where the same value stored in a cache
  produced a different key, then this fix will interest you. For more
  information, see #285.

* You can now override translate_format in I18n::Backend classes to customize
  how localize will perform. See #347 (comment) for more details.

* You can now interpolate the value of a key inside another key. See #300 for
  more information.

* The exists? method was added to the fallback backend, to match other backend
  implementations - #326

* Added N_ to GetText::Helpers - #121

* Added a :default option for I18n.localize - #251

Bug fixes

* Reverted a commit which made it so that the great documentation for
  I18n.translate wasn't made visible through a yard documentation
  generation. - bc926eb

* I18n.MissingTranslation.new can now be called with two arguments. It will no
  longer raise a "TypeError: can't dup NilClass" exception - #295

* I18n's Hash#slice method no longer fails if the hash does not have the
  specified key - #289

* I18n::Backend::Metadata will now no longer attempt to set
  @translation_metadata on frozen objects - #305

* Added missing many rule to pl translation rules - #346

* Calling I18n.t(:foo, default: nil) Or I18n.t(:foo, default: false) will now
  return nil or false, rather than returning a missing translation exception -
  #144

* Setting I18n.load_path via I18n.load_path= will now reset the
  @@available_locales_set setting. - #348 & #173

* The subclasses of Hash when calling Hash#slice are maintained - #250

* Fixed I18n.interpolate behaviour when it was passed an
  ActiveSupport::SafeBuffer object - #216