Xliff files with file extension xml are passed to okapi instead of translate5s xliff parser

Please find a test xml file attached, that should be passed directly to translate5s xliff parser, but is not.

We once hat a test for the xliff declaration inside the xml file, that decided upon the parser.

If you import the attached test.xml file, you see, that you get an export with test.xml and test.xml.xlf inside.

With the test.xml.xliff as import file you only get the test.xml.xliff file back in the export zip.