Add (early) gettext support
update .gitignore
gettextify in about.c,app_server.c,controls.c
add all .c files to POTFILES.in
gettextify m*.c
gettextify options
gettextify termcmd.c,termio.c,termpty.c,termptyesc.c
review translation strings. Closes T1433
clip media controls. Cf T1369
use autogen.sh from e. should fix jenkins' issue

Thanks to discomfitor
should have removed that comment