This commit adds personalization options for the Contact Us links on
edx-platform's
page.
To allow for this customization, two SiteConfiguration variables were
added:
* CONTACT_US_ENABLE: Switch to enable/disable the Contact Us page.
Setting this to
False will disable the contact page and the links on the footer will
disappear.
* CONTACT_US_CUSTOM_LINK: If the contact page is enabled, this setting
allows to set
a custom URL for the Contact Us links on edx-platform. If this setting
is not set,
the platform will use the default contact form.
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