Bug 35279: Add fallback to print for 'Send welcome email'

Bug 35279: Add fallback to print for 'Send welcome email'

We update the 'Send welcome email' button to read 'Send welcome notice'
and add a fallback to enqueue a notice for print when the user doesn't
have an email address defined.

Test plan
1) Apply patch
2) Use the 'Henry Acevedo' user who doesn't yet have a valid email
   address.
3) Click the 'Send welcome notice' button available from the 'more'
   menu.
4) Note that no notice is queued at all.
5) Copy the content of the 'email' WELCOME notice into the 'print'
   template.
5) Repeat step 3.
6) Note that this time a 'print' type notice is queued for the user.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>