Update render_setLocalizedXml function.
    
    - Previously, at source instance verification, the mime verification
      was called before knowing whether source instance is a temporal file
      or a design model. This made centos-art.sh script to stop rendition
      because, at that point, it is possible to find both compressed files
      and xml files, not just xml files. This update moves the mime
      verification into temporal file verification block, where only xml
      files must be present.