Revert support for case insensitive sample/data names (#2576)

Author: XingY

data/api/rlabkey-api-experiment.xml

@@ -285,7 +285,7 @@
             <![CDATA[
                 Rows via createAndLoad = 3
                 Rows via insert = 2
-                already exists
+                duplicate key
                 Rows via merge = 10
                 Has audit transaction id = TRUE
              ]]>

src/org/labkey/test/tests/SampleTypeTest.java

@@ -456,7 +456,7 @@ public void testImportTypeOptions()
         String overlap =  "Name1\tToBee\n";
         String newData = "Name2\tSee\n";
         setFormElement(Locator.name("text"), header + overlap + newData);
-        clickButton("Submit", "already exists");
+        clickButton("Submit", "duplicate key");
 
         log("Switch to 'Insert and Replace'");
         importDataPage.setCopyPasteMerge(true);
@@ -481,7 +481,7 @@ public void testImportTypeOptions()
         importDataPage = drt.clickImportBulkData();
         importDataPage.setFile(sampleData);
         final String errorText = importDataPage.submitExpectingError();
-        Assert.assertTrue("Wrong error when importing duplicate samples. " + errorText, errorText.contains("already exists"));
+        Assert.assertTrue("Wrong error when importing duplicate samples. " + errorText, errorText.contains("duplicate key"));
         // TODO: Regression check for Issue 44202: Ugly error when data import fails due to duplicate key
         // Assert.assertTrue("Wrong error when importing duplicate samples. " + errorText, errorText.length() < 100);