Spotted by: @fabianfrz

o Page did not work with translations.
o Selected serial device wasn't shown.
o Very old gpsport migration code zapped.
o set_gps_default() must trigger on load.

This brings us down from 2.2 seconds to 0.2 seconds reload time
*without* the obscure caching in place.  This will likely solve
the filter reload issues that some people had.  :)

Taken from: https://translate.opnsense.org/

fixes for load_balancer_maintable.inc (#427)