Issue #3174924 by joachim, xjm, smustgrave, sourabhjain, ranjith_kumar_k_u, kiwimind, catch, bnjmnm: Throw a better exception when a reference field can't find the target entity type

Issue #3173180 by heddn, edysmp, chrisfree, andypost, markdorison, anmolgoyal74, kiwimind, rkoller, ranjith_kumar_k_u, nod_, Fabianx, prudloff, quietone: Add UI for 'loading' html attribute to images

Issue #3086850 by MasterBranch, ravi.shankar, joachim, hchonov, kiwimind, mglaman, jhedstrom: "Cannot load a NULL ID" assertion in EntityStorageBase should say the entity type

Issue #3030929 by kiwimind, Kavichandran P, c.nish2k3, quietone: User migrations tests in wrong directory

Issue #2674292 by starshaped, tim.clifford, sskt, nesta_, kostyashupenko, mukeshMukesh12, alamowo, ironkiat, emma.maria, Manjit.Singh, kiwimind, Cottser, phenaproxima, yoroy, AaronChristian: Remove styling of select elements (improves appearance in Firefox)

Issue #808416 by lostchord, daniels220, gaurav.kapoor, jp.stacey, JacobSanford, er.pushpinderrana, jhodgdon, oriol_e9g, kiwimind, Dries: Document that clock drift will cause lock system to fail

Issue #2781927 by pguillard, kiamlaluno, Eda, kiwimind: Improve description of render array properties and examples