Manually require i18n 0.4.2 before Rails tries to load the most recent gem (#7013).

This workaround makes Redmine work even if i18n 0.5.0 gem is installed.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4516 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/boot.rb

@@ -106,5 +106,17 @@ module Rails
   end
 end
 
+# TODO: Workaround for #7013 to be removed for 1.2.0
+# Loads i18n 0.4.2 before Rails loads any more recent gem
+# 0.5.0 is not compatible with the old interpolation syntax
+# Plugins will have to migrate to the new syntax for 1.2.0
+require 'rubygems'
+begin
+  gem 'i18n', '0.4.2'
+rescue Gem::LoadError => load_error
+  $stderr.puts %(Missing the i18n 0.4.2 gem. Please `gem install -v=0.4.2 i18n`)
+  exit 1
+end
+
 # All that for this:
 Rails.boot!