Starting from version 0.19, gettext has native capabilities to extract
from, and merge back translations in desktop files.
Hence, use xgettext to extract messages, and msgfmt to create a desktop
file with translations; because of this, there no more need to prefix
with underscore the keys to be translated.
Update the gettext required version in INSTALL.md.
Reviewed-by: Cole Robinson <crobinso@redhat.com>
Signed-off-by: Pino Toscano <ptoscano@redhat.com>
Despite being a known quantity, autotools is so overkill for our needs,
so let's drop it and replace it with a much simpler and easy to customize
system.