번역 - Reklam 'Magnum' yazan metin ile baÅŸlar. (터키어)

Yup. That's what they call "subtitles" here in Japan -- "supers" -- and it seems the most reasonable explanation.
I think we can safely say
...a super that reads 'magnum
means
...some text printed on the screen, that begins "magnum..."

thank you very much, kafetzou and Professor Ian!

kfeto, 'super'sin
profesör Ian'ın verdiği örneğe göre, 'metin' yerine 'altyazı' ifadesini kullanmak isabetli olur, değil mi?...
reklam 'magnum'(yazan) altyazıyla başlar... gibi

No no no - it's not a "subtitle"! Ian just said that's what they call them in Japan. It's a word or words superimposed on the image that's on the screen.

For example, each of these videos, done by my boyfriend, starts with a "super".

here teaches me something new again, thank you all

oh, thanks kafetzou
then, we'll change a word only...

'Reklam 'Magnum' yazan bir metinle baÅŸlar.'

instead of 'metin' we can use just 'yazı' :

'Reklam 'Magnum' yazısı ile başlar.'

Reklam 'Magnum' diyen bir metin ile baÅŸlar.

cok teşekkürler arkadaşlar