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

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

Operating SystemInstaller to downloadSizeHow to install
WindowsXXEFrenchSetup.exe915KBRun the installer. It will do all that is needed.
Mac OS XXXEFrench.dmg787KBRun the installer. It will do all that is needed.
LinuxXXEFrenchSetup.tar.gz773KB
  1. Decompress and extract the installer in some directory.
  2. In a Terminal, do
    sudo ./installxxefrench