This is a typical way of congratulating someone in the Afrikaans language. It means literally "much luck". You can also use it in the full sentense by adding the specific reason for the congratulations at the end (see example).
"veels geluk met jou verjaarsdag" (congratulations on your birthday)
"veels geluk op 'n groot taak wel gedaan" (congratulations on a job well done)
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