Pull updated translations from transifex

In particular, italian updates in introduction are fetched after
manual editing from the web interface. The "fuzzy" strings were
reported by transifex as "suggestions" and the corresponding
entries were reported as "untranslated".

git-svn-id: http://svn.osgeo.org/postgis/trunk@13096 b70326c6-7e19-0410-871a-916f4a2858ee