set language en to test_label_for at test/unit/query_test.rb

set language en to test_label_for at test/unit/query_test.rb

Test on CI Server fails.

http://www.redmine.org/builds/logs/build_trunk_sqlite3_ruby-1.9.3-p194_581.html

<pre>
Failure:
  <"Assignee">("US-ASCII") expected but was
  <"Assigné à">("UTF-8").
test_label_for(QueryTest)
test/unit/query_test.rb:860:in `test_label_for'
</pre>

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10249 e93f8b46-1217-0410-a6f0-8f06a7374b81