Add missing source files to nls.mk

Add missing source files to nls.mk

Files in common/ and fe_utils/ that contain translatable strings need
to be listed in the nls.mk files of the programs that use them.  (Not
great, but that's the way it works for now.)  This usually requires
some manual analysis which is done about once during each major
release beta period.  This time, I wrote a hackish script that figures
some of this out more automatically, so this update is a bit larger as
it also includes some files that were missed in the past.