If you want to hard-code the language Seterra uses at start-up, e.g. in a network environment, you can do this via a command line argument in version 4.02.21 or later.
“C:\Program Files\Seterra\Seterra.exe” /lang=sv
will force Seterra to always start in Swedish. The following language abbreviations are available:
zh Chinese (simplified)
pt Portuguese (Brazil)