Installing Recipes master via Flatpak

[Julien hardelin <jhardlin orange fr>]

Hi,

For translation needs, I tried to install the development version of 
Recipes, under Ubuntu-16.04:

- I downloaded gnome-recipes.flatpakref.

- I ran: sudo flatpak install Downloads/gnome-recipes.flatpakref,

- and I got the message:

Note that '/var/lib/flatpak/exports/share' is not in the search path
set by the XDG_DATA_HOME and XDG_DATA_DIRS
environment variables, so applications may not
be able to find it until you set them. The
directories currently searched are:

- /home/xxx/.local/share
- /usr/local/share/
- /usr/share/

Recipes in not installed.

XDG_DATA_HOME and XDG_DATA_DIRS are empty.(echo $...)

What must I do to have that flatpakref installed?

Julien