Test fails on Rails 3.0.11 and Ruby 1.8.7.
<pre>
Failure:
test_number_to_human_size_for_each_language(Redmine::I18nTest)
[test/unit/lib/redmine/i18n_test.rb:114:in `test_number_to_human_size_for_each_language'
test/unit/lib/redmine/i18n_test.rb:112:in `each'
test/unit/lib/redmine/i18n_test.rb:112:in `test_number_to_human_size_for_each_language']:
sk failure.
Exception raised:
TypeError(<can't convert nil into String>)
</pre>
