Bug 16841: Help for library EANs

Bug 16841: Help for library EANs

To test:

1) Go to Admin -> Library EANs
2) Click Help in top-right corner
3) Confirm that Help window opens with appropriate help text
4) Confirm link to manual works as expected

Sponsored-by: Catalyst IT
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Fixed link to the manual.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 0a92669c229a04dc50b17569ae5d0c132a983fe2)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>