Issue #2991149 by eliclaggett, Angélique Valvandrin, prashantgajare, andrewmacpherson, nod_, DuaelFr, TwoD, alexpott, Manuel Garcia, mgifford, seangambierross, jhodgdon, Kolin, dat deaf drupaler: Improve placeholder text for image upload

Issue #2779919 by andrewmacpherson, joelpittet, mikeker, UpTil4Music, if-jds, Kolin, John Cook: Stable theme does not respect "visually hidden" field label display option