group/institution/site collection while editing a group/institution/site
page.

(Bug #1032013)

When adding a collections block in a group/institution/site page, if
there is no group/institution/site collection, a message is displayed
including a link to create a collection. This link does so, but for a
personal collection, not a group/institution/site one. The message needs
to be updated for this use case.

Change-Id: I446d94d493397ccda79d613fda5b2f320d22e7f9
Signed-off-by: Son Nguyen <son.nguyen@catalyst.net.nz>