Replaced %1's with URL's to make the errors more descriptive.

Change-Id: I441085a7704eb3464e13723d8dc2ee1df833bd46
Reviewed-on: https://gerrit.libreoffice.org/10931
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>