Further update translations

Italian was edited locally and already pushed to transifex,
French was edited on transifex and pulled locally.

git-svn-id: http://svn.osgeo.org/postgis/trunk@13097 b70326c6-7e19-0410-871a-916f4a2858ee
Really use DBLATEX variable

git-svn-id: http://svn.osgeo.org/postgis/trunk@13098 b70326c6-7e19-0410-871a-916f4a2858ee