Cleanup: Remove unused parameter in xliff2odf

This is no longer needed since we dropped the ability to include the XLIFF
file within the ODF package.
WORKING ON IT: Add IDML converter
WORKING ON IT: Now it parses just the Content tags and skips CDATA
WORKING ON IT: Convert to PO instead of XLIFF works!!
WORKING ON IT:    Trying to get roundtrip conversion working