Update the contact page email

Add recipient information (name, email address, sender IP address)
Update some of the files for the 2.3.2 release
Update the CHANGELOG and README
Update header files for use on a secure domain
Add contact info to the GM docking form email
Fix wrong language key in the ajax controller
Final pieces for the 2.3.2 release
Merge branch '2.3/develop' into 2.3/master