Changed code to support basic i18n.

Added RubyMine configuration and rvm setup to .gitignore.

app/controllers/application_controller.rb

@@ -33,10 +33,12 @@ class ApplicationController < ActionController::Base
   before_filter :set_session_expiration
   before_filter :set_time_zone
   before_filter :set_zindex_counter
+  before_filter :set_locale
   prepend_before_filter :login_required
   prepend_before_filter :enable_mobile_content_negotiation
+  after_filter :set_locale
   after_filter :set_charset
-
+  
   include ActionView::Helpers::TextHelper
   include ActionView::Helpers::SanitizeHelper
   extend ActionView::Helpers::SanitizeHelper::ClassMethods
@@ -47,6 +49,12 @@ class ApplicationController < ActionController::Base
     headers["Content-Type"] ||= "text/html; charset=UTF-8" 
   end
   
+  def set_locale
+    locale = params[:locale] || request.env['HTTP_ACCEPT_LANGUAGE'].scan(/^[a-z]{2}/).first
+    I18n.locale = I18n::available_locales.include?(locale) ? locale : I18n.default_locale
+    logger.debug("Selected '#{I18n.locale}' as locale")
+  end
+  
   def set_session_expiration
     # http://wiki.rubyonrails.com/rails/show/HowtoChangeSessionOptions
     unless session == nil
@@ -196,7 +204,7 @@ class ApplicationController < ActionController::Base
   
   def admin_login_required
     unless User.find_by_id_and_is_admin(session['user_id'], true)
-      render :text => "401 Unauthorized: Only admin users are allowed access to this function.", :status => 401
+      render :text => t('errors.user_unauthorized'), :status => 401
       return false
     end
   end