eventd.m4: Use a full custom rule for event files i18n

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
events: Do not Git generated files

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
events: Fix distcheck

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>