Issue #2223967 by jofitz, LKS90, AdamPS, sja112, shaktik, pminf, Berdir, mxr576, bmcclure, Manuel Garcia, naveenvalecha, Gogowitsch, andypost, alexpott, jonathanshaw, claudiu.cristea, greggles: Do not decode a contact message twice

Issue #2557299 by alexpott, Manuel Garcia, borisson_, phenaproxima, swentel, Berdir, larowlan, mbovan, martin107, LKS90, segi, tim.plunkett, giancarlosotelo: Any AJAX call disregards machine name verification when AJAX is used and leads to a fatal error

Issue #2543258 by LKS90, hchonov, tassilogroeper, sasanikolic, Berdir, yched, plach: Entity references of untranslatable fields are not displayed in the correct  translation