The translations on Spanish (Mexico) are more active than on Spanish
Moreover, most other countries speaking a variant of Spanish are
located in Latin America and are closer to es_MX than es.
To solve this, when installing for instance es_AR, the translations
will be loaded in the following order:
1 es
2 es_MX
3 es_AR
In case a term is translated in both es and es_MX (and not es_AR), the
later will be used
closesodoo/odoo#121415
Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>