Hi MarekR,
I believe that this issue won’t ever be fixed.
Anyway you could try to open the same topic again but for me it’s a waste of time.
Qtranslate is much better than WPML and you are be able to translate all the ACF fields by combining QTranslate, acf qTranslate and qTranslate slug.
Cheers
I decided to use qTranslate plugin rather then WPML.
No problem with ACF Gallery with it.