Add the following translatable strings to sys.xml: license-url,
units-kbytes, units-kbytes-per-sec, units-mbytes, and
units-mbytes-per-sec.
I know that the SI prefix for kilo is 'k', not 'K', and that these KB
and MB "units" have no well-defined meaning. This is not my choice; just
trying to help with
<https://sourceforge.net/p/flightgear/fgdata/merge-requests/273/>.
1b0e2147ad