This PR adds a new colorField function to create an html color field (<input type="color">) as described at https://developer.mozilla.org/en-US/docs/Web/HTML/Element/Input/color
“obligatoriskt” was probably left over from the Swedish translation and should be “obligatorisk” “sannhetsverdi” is the established term for a boolean “Slett?” should be “Slette?” if the orignal string means “[Do you want to ]delete?”
