We now use support_email == settings.ZULIP_ADMINISTRATOR just like every other support email address reference.
The check-handlebars-templates script now looks at most of our back end templates to try and find imbalanced tags. This commit fixes a bunch of the existing templates. (imported from commit fad4a5d85d68160370dd588b41d6f125f64d198f)
(imported from commit e2c5f72d3f3e4d8f8fa888326b2ba455beb9156c)