Ruby on Rails
OverridingRailsMessagesInAnotherLanguage

please see the Rails Plugins localization_simplified or GlobaLite “localization made simple and lite.” Read more
They both include most of the things mentioned below.

While Rails and Ruby are not yet internationalized, there are still some things you can do. As Ruby classes and modules are open, you can change them from your own code. I have a directory app/overrides which contains among other things these files, resulting in german validation error messages and month names

# active_record/errors.rb

module ActiveRecord
  class Errors
    begin
      @@default_error_messages.update( {
        :inclusion => "ist nicht in Liste gültiger Optionen enthalten",
        :exclusion => "ist reserviert",
        :invalid => "ist ungültig",
        :confirmation => "entspricht nicht der Bestätigung",
        :accepted  => "muss akzeptiert werden",
        :empty => "darf nicht leer sein",
        :blank => "darf nicht leer sein",
        :too_long => "ist zu lang (höchstens %d Zeichen)",
        :too_short => "ist zu kurz (mindestens %d Zeichen)",
        :wrong_length => "hat eine falsche Länge (es sollten %d Zeichen 
sein)",
        :taken => "ist schon vergeben",
        :not_a_number => "ist keine Zahl",
      })
    end
  end
end

# date.rb

require 'date'

class Date
  MONTHNAMES = [nil, 'Januar', 'Februar', 'März', 'April', 'Mai',
                'Juni', 'Juli', 'August', 'September', 'Oktober',
                'November', 'Dezember' ]
end

# all.rb

Dir[File.dirname(__FILE__) + "/**/*.rb"].each { |file| require(file) }

Then, at the end of config/environment.rb I have

require "#{RAILS_ROOT}/app/overrides/all"

This is definitely not pretty. The best I can say is that it appears to
work and keeps the intrusive code confined to one place. It would be much better, if all verbatim strings within Rails were piped through gettext or similar.

One could use the method shown above to load gettext and wrap _() around the original verbatim strings. If there are no localizations, _() simply returns its argument so everything remains as it is, but for those willing/needing to localize the strings, there would be a clean hook to do so.

—MichaelSchuerig

You also might wish to override the basic error messages used in scaffolded pages and _error_for_ helper:

<pre> module ActionView #nodoc module Helpers module ActiveRecordHelper def error_messages_for(object_name, options = {}) options = options.symbolize_keys object = instance_variable_get("@#{object_name}") unless object.errors.empty? content_tag("div", content_tag( options[:header_tag] || "h2", "#{pluralize(object.errors.count, "error")} prohibited this #{object_name.to_s.gsub("_", " ")} from being saved" ) + content_tag("p", "There were problems with the following fields:") + content_tag("ul", object.errors.full_messages.collect { |msg| content_tag("li", msg) }), "id" => options[:id] || "errorExplanation", "class" => options[:class] || "errorExplanation" ) end end end end end </pre>

and put this modification in the same file.

ri Date reveals the other constants awaiting localization: DAYNAMES, ABBR_MONTHNAMES and ABBR_DAYNAMES.

— Charles M. Gerungan

Globalize plugin has all this constants translated in quite a few languages already.

— Benol

NOTE: If your’re running fastCGI, you’ll have to stop and restart your web server after modifying environment.rb.

—-

How can I do if I want multiple languages (for exemple: Fr, de,en) ?

See also HowToLocalizeActiveRecordErrors

—-
A much nicer way to override the date constants is like so:
<pre> require 'date'

1. English: [nil] + %w(January February March April May June July August September October November December)
   Date.const_set “MONTHNAMES”, [nil] + %w(janúar febrúar mars apríl maí júní ágúst september október nóvember desember)
2. English: [nil] + %w(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)
   Date.const_set “ABBR_MONTHNAMES”, [nil] + %w(jan feb mar apr maí jún júl ág sept okt nóv des)
3. English: %w(Sunday Monday Tuesday Wednesday Thursday Friday Saturday)
   Date.const_set “DAYNAMES”, %w(sunnudagur mánudagur þriðjudagur miðvikudagur fimmtudagur föstudagur laugardagur)
4. English: %w(Sun Mon Tue Wed Thu Fri Sat)
Date.const_set “ABBR_DAYNAMES”, %w(sun mán þri miðv fim fös lau)


—-
IMHO a much better way to do that is to just use ruby-gettext’s rails extension.

— terceiro

category: I18n