String announcement from Maps

[Jonas Danielsson <the sator gmail com>]

Hi!

I just added the string: "Drag to change order of the route", to Maps.

It is a tooltip on an icon next to the route search text entries. To
make it more clear that you can drag them to re-order the route by
Drag'n'Drop.

Bug here:
https://bugzilla.gnome.org/show_bug.cgi?id=762854

cast here:
https://bugzilla.gnome.org/attachment.cgi?id=322648

Jonas