WebMessage: English corrections in output messages

* Fixes English in output messages.  (closes #1849)

Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Miscutils: fix for send_email error on DEV site

* For the DEV site send_email function was failing while trying to
  concatenate list and string (because the CFG_SITE_ADMIN_EMAIL
  was not a list).