To install a translation SH3L file, download it by clicking on one of the previous links (1 MB each), then under Windows and Mac OS X, double click on it to install and use it in Sweet Home 3D.
Under Linux, if you run Sweet Home 3D from its installer, you can install a SH3L file by opening it with
SweetHome3D application contained in the installation folder of Sweet Home 3D, or by running the following command in a Terminal window:
If you run Sweet Home 3D from Java Web Start, run the following command in a Terminal window:
javaws http://www.sweethome3d.com/SweetHome3D.jnlp -open /path/to/Korean-3.2.sh3l
If you want to switch back to another language, use Language drop drown list in preferences pane, as for any language supported in Sweet Home 3D.
Many thanks to 백호석 (Hosuk Baek) for his great contribution!