rpm fedora: fix bogus day of the week
rpm fedora: remove needless '%{dir}'

Because '%{dir}' should be applied to directory.
rpm fedora: use systemd base package instead of systemd-units subpackage

In recent fedora, the systemd-units subpackage has been merged into the base package.
rpm fedora: add missing BR
rpm fedora: unify own directories of plugins
doc en: update po