The text of the submit button on Add Comment page is changed from " Add " to "Add"?

junit.framework.AssertionFailedError: Submit Button [ Add ] not found.
at junit.framework.Assert.fail(Assert.java:47)
at junit.framework.Assert.assertTrue(Assert.java:20)
at net.sourceforge.jwebunit.junit.WebTester.assertSubmitButtonPresent(WebTester.java:1694)
at com.atlassian.studio.livetest.PrintingPageWebTester.assertSubmitButtonPresent(PrintingPageWebTester.java:1111)
at net.sourceforge.jwebunit.junit.WebTester.submit(WebTester.java:2448)
at com.atlassian.studio.livetest.FuncTestWebTester.submit(FuncTestWebTester.java:139)
at com.atlassian.studio.functest.TestStudioProjectDeletion.testDeleteProjectWithDataSuccessful(TestStudioProjectDeletion.java:88)