Ebuild gentoo translation

Hello
I want to modify the ardour ebuild on my gentoo so that it compiles the translations in /usr/share/ardour5/locale/…
I downloaded the Ardour-5.12.0.tar.bz2, on the ardour site and read the TRANSLATORS file. The gentoo ebuild file does not specify the following commands: waf i18n_pot and waf i18n_mo.
We can use the local folder copied to another linux distribution but it is not very clean.

The ebuild

#Copyright 1999-2017 Gentoo Foundation
#Distributed under the terms of the GNU General Public License v2

EAPI=6
PYTHON_COMPAT=( python2_7 )
PYTHON_REQ_USE=‘threads(+)’
#EPYTHON=‘python2.7’
inherit eutils toolchain-funcs flag-o-matic python-any-r1 waf-utils

DESCRIPTION=“Digital Audio Workstation”
HOMEPAGE=“http://ardour.org/

if [[ ${PV} == 9999 ]]; then
EGIT_REPO_URI=“http://git.ardour.org/ardour/ardour.git
inherit git-r3
else
KEYWORDS="~amd64 ~x86"
SRC_URI=“mirror://gentoo/Ardour-${PV}.0.tar.bz2 -> ${P}.tar.bz2”
S="${WORKDIR}/Ardour-${PV}.0"
fi

LICENSE=“GPL-2”
SLOT=“5”
IUSE=“altivec doc jack cpu_flags_x86_sse cpu_flags_x86_mmx cpu_flags_x86_3dnow”

RDEPEND="
>=dev-cpp/glibmm-2.32.0
>=dev-cpp/gtkmm-2.16:2.4
>=dev-cpp/libgnomecanvasmm-2.26:2.6
dev-libs/boost:=
>=dev-libs/glib-2.10.1:2
dev-libs/libsigc++:2
>=dev-libs/libxml2-2.6:2
dev-libs/libxslt
>=gnome-base/libgnomecanvas-2
media-libs/alsa-lib
media-libs/aubio
media-libs/flac
media-libs/freetype:2
media-libs/libart_lgpl
media-libs/liblo
>=media-libs/liblrdf-0.4.0-r20
>=media-libs/libsamplerate-0.1
>=media-libs/libsndfile-1.0.18
>=media-libs/libsoundtouch-1.6.0
media-libs/raptor:2
>=media-libs/rubberband-1.6.0
>=media-libs/taglib-1.7
media-libs/vamp-plugin-sdk
net-misc/curl
sys-libs/readline:0=
sci-libs/fftw:3.0[threads]
virtual/libusb:0
x11-libs/cairo
>=x11-libs/gtk±2.8.1:2
x11-libs/pango
jack? ( virtual/jack )
>=media-libs/slv2-0.6.1
media-libs/lilv
media-libs/sratom
dev-libs/sord
>=media-libs/suil-0.6.10
>=media-libs/lv2-1.4.0"

DEPEND="${RDEPEND}
${PYTHON_DEPS}
jack? ( virtual/jack )
sys-devel/gettext
virtual/pkgconfig
doc? ( app-doc/doxygen[dot] )"

pkg_setup() {
if has_version >=dev-libs/libsigc+±2.6 ; then
append-cxxflags -std=c++11
fi
python-any-r1_pkg_setup
}

src_prepare(){
eapply_user
if ! [[ ${PV} == 9999 ]]; then
eapply “${FILESDIR}”/${PN}-4.x-revision-naming.patch
touch “${S}/libs/ardour/revision.cc”
fi
sed ‘s/‘full-optimization’\ :\ \[.’/‘full-optimization’\ :\ ‘’,’/’ -i “${S}”/wscript || die
MARCH=$(get-flag march)
OPTFLAGS=""
if use cpu_flags_x86_sse; then
if [[ ${MARCH} == “i686” ]] || [[ ${MARCH} == “i486” ]]; then
elog “You enabled sse but use an march that does not support sse!”
elog “We add -msse to the flags now, but please consider switching your march in make.conf!”
fi
OPTFLAGS=“sse”
fi
if use cpu_flags_x86_mmx; then
if [[ ${MARCH} == “i486” ]]; then
elog “You enabled mmx with i486 set as march! You have been warned!”
fi
OPTFLAGS="${OPTFLAGS} mmx"
fi
if use cpu_flags_x86_3dnow; then
OPTFLAGS="${OPTFLAGS} 3dnow"
fi
sed 's/flag_line\ =\ o.
/flag_line\ =\ “: '”${OPTFLAGS}"’ just some place holders"/’
-i “${S}”/wscript || die
sed ‘s/cpu\ ==\ .*/cpu\ ==\ “LeaveMarchAsIs”:/’ -i “${S}”/wscript || die
append-flags “-lboost_system”
python_fix_shebang “${S}”/wscript
python_fix_shebang “${S}”/waf i18n_po
}

src_configure() {
tc-export CC CXX
mkdir -p “${D}”
waf-utils_src_configure
–destdir="${D}"
–prefix=/usr
–configdir=/etc
–nls
–optimize
–lv2
$(usex jack “–with-backends=alsa,jack” “–with-backends=alsa --libjack=weak”)
$(usex doc “–docs” ‘’)
$({ use altivec || use cpu_flags_x86_sse; } && echo “–fpu-optimization” || echo “–no-fpu-optimization”)
}

src_install() {
waf-utils_src_install
mv ${PN}.1 ${PN}${SLOT}.1
doman ${PN}${SLOT}.1
newicon “${S}/gtk2_ardour/resources/Ardour-icon_48px.png” ${PN}${SLOT}.png
make_desktop_entry ardour5 ardour5 ardour5 AudioVideo
}

pkg_postinst() {
elog “If you are using Ardour and want to keep its development alive”
elog “then please consider to make a donation upstream at ${HOMEPAGE}.”
elog “Please do not report problems with the package to ${PN} upstream.”
elog “If you think you’ve found a bug, check the upstream binary package”
elog “before you report anything to upstream.”
}