...for strings, too
this is done by a) scanning for all .lua files additionally to all
.cfg files in FINDCFG and b) by adding the equivalent of a "commented
out" #textdomain DOMAIN declaration
next step: testing if it really does work as expected this should also
fix bug #15629 since the objectives are now *only* declared via some
lua magic
...and removed it from the wesnoth domain also added the editor theme
to the editor domain (has no translable items yet)
Ivanovic please verify that the intent and effect are the same ;)
needs a pot-update before the strings appear
moving three strings from the editor theme into the mainfile, because
this way "autodetection" of new theme files can be used
