Fix most glaring bugs and vulnerabilities

express/middleware/index.js

@@ -2,6 +2,13 @@ const { getInstanceSetting } = require('../models/helpers')
 
 exports.enhanceLocals = async (req, res, next) => {
   res.locals.portalCode = await getInstanceSetting('portal_code')
+  res.locals.flashInfo = req.flash('info')
+
+  next()
+}
+
+exports.adjustHeaders = async (req, res, next) => {
+  res.set('Cache-Control', 'no-cache, private')
 
   next()
 }