Allow network managers to modify contact form

[SteelWagstaff]

Feature Description

The current Aldine contact form has four required fields: name, email, institution, and message. Some network manager would like to customize the labels for these fields and make some of them optional. For example, they may wish to change the 'institution' label to 'division' or 'department' or 'role' and make it optional. Giving network managers some tools to customize the contact form in Aldine's customizer would satisfy this need.