talkatu/talkatu

Update the demo to default the author to Alice and add a keybinding for ctrl-w

Testing Done:
Ran the demo and verified the author was set and that ctrl-w closed the window and therefore the application.

Reviewed at https://reviews.imfreedom.org/r/1281/
if get_option('nls')
i18n.gettext(GETTEXT_PACKAGE)
endif