DateFormatUtilsTest.testSMTP depends on the default Locale

DateFormatUtilsTest.testSMTP depends on the default Locale and expects this to be Locale.EN. When running the test with the different default Locale (e.g. Locale.GERMANY) it will fail with the following message:

org.junit.ComparisonFailure: 
Expected :Sun, 08 Jun 2003 10:11:12 -0300
Actual   :So, 08 Jun 2003 10:11:12 -0300

Solution: Set the default Locale before the test runs and reset it afterwards.