Hi there,
Are you developing the dictation engine? because I never seen Arabic reco SDK for Android..
Anyhow, and even though there's so many accents and dialects, but the "Proper Arabic" that's spoken by all countries, newspapers and media outlets
is the same.. speeches and school lectures are all given by Proper Arabic.
Regarding marketing your product, if it's translated into Arabic then it will have the potential to reach 80% more audience!. even when the educated speak
English very well, but they will feel more comfortable to use apps in Arabic, besides the majority doesn't speak English.
good luck
p.s.
My knowledge on Hebrew is very little.