If you have version 5.3.0 of the XMLmind XML Editor, then you can download and install a Spanish user interface and dictionary package.

To do so, download and install the package per your operating system:

Operating SystemInstaller to downloadSizeHow to install
WindowsXXESpanishSetup.exe527KBRun the installer. It will do all that is needed.
Mac OS XXXESpanish.dmg405KBRun the installer. It will do all that is needed.
LinuxXXESpanishSetup.tar.gz390KB
  1. Decompress and extract the installer in some directory.
  2. In a Terminal, do
    sudo ./installxxespanish