Ah well, still a banger. Thanks for introducing it to me

Because I’ll say it only once

Wenn inch sag es nur einmal.

Would this translate better to

When I say it one more time.

It reinforces that they’ll say it as many times as they need, and since they repeat the chorus twice “say it only once” doesn’t make sense.

My German is rusty so I could easily be wrong. I appreciate the translation and the song is going in my playlists for sure.