Update ruby-gettext to 1.92.0.
Notes:
* Fixed a memory leak(again)
* Fixed bugs.
* Improve to support mo-files.
* Support revision 1 of mo-file format.
* Freeze msgstrs.
* msgctxt - pgettext(msgctxt, msgid) support
(eg)
p_("File", "Open") #=> "Open" is shown in English.
* Update translations
* Catalan, Chinese(Simplified), Chinese(Traditional), (English), Esperanto, German,
Greek, Hungarian, Latvian, Japanese, Norwegian, Portuguese(pt_BR), Russian, Serbian,
Spanish, Ukrainian, Vietnamese,
* Rails Support
* Support rubyonrails-2.1.0 (2.0.0 or later).
* Add new validations for activerecord-2.1.0.
(:greater_than, :greater_than_or_equal_to, :equal_to,
:less_than, :less_than_or_equal_to,:odd, :even)
* validates_(format|inclusion)_of accepts %{val} as the value
(eg)
validates_inclusion_of :name, :in => %w(a, b), :message => N_("%{fn} can't be %{val}")
* Work Fragment caching on rails-2.1.0.
* Support ActiveRecord::Base.abstract_class.
* Work ActiveRecord::Errors#[]
* Work render_partial.
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