Amabile degli angeli means literally: lovable/amiable by (the) angels, but since Amabile is capitalized here it is just a brand name: Amabile of the angels. BTW if you want to say: amiable by (the) angels, that is: amabile dagli angeli. "da" is by/from, "de" is of (followed by an article, "of" without any article following is "di"). Amabile means amiable, indeed they are very similar. Un vino amabile=a lovable/an amiable wine (a smooth wine).