The SWORD converters are used by Bibledit when converting a project into a SWORD module. These converters are part of the SWORD API. To get the converters to work the whole API needs to be installed.
Install it all this way:
Download the SWORD API for Linux from http://www.crosswire.org/sword/software and put it in the home directory.
Open a terminal.
To verify the package is there, type
ls
A file like sword-x.x.x.tar.gz should be visible there. The x.x.x. represents the version number.
To unpack the compressed tarball, type
tar zxf sword-x.x.x.tar.gz
To go into the subdirectory created, type
cd sword-x.x.x
To configure the package, type
configure --prefix=/usr
To compile the package, type
make
To install the package, type
sudo make install