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Fijne verjaardag, gefeliciteerd met je verjaardag.

Gelukkige verjaardag woudt olso be corect, but it is not the way it is used.

Told you it's useless. Similar but wouldn't take that long to learn Dutch I don't think. The basics are there somewhat.

It is more then just basics. Everybody here would understand you and be charmed by your accent.