Here's the grid with the messages highlighted. Apologies for the untrimmed image -- I'm doing this on a mobile device with limited capabilities. I'll fix it up in a moment.
The messages say
around the outside: HARI RAYA IDUL FITR (which I think is just another way of saying Eid al-Fitr);
above: MINAL AIDIN WAL FAIZIN (similar to the "Many happy returns" used in English on people's birthdays);
below: MOHON MAAF LAHIR BATIN (which Google Translate renders as "Forgive me body and soul"; I guess it's a greeting used during Ramadan?);
in the middle: SELAMAT LEBARAN (equivalent to the more familiar "Eid mubarak").