Muslim is a religion, not a language. Please pick a language and someone can tell you how to say "good afternoon" in it!
You say "Good afternoon!" in Yoruba language of the Western African origin as "Ek'asan".
In Filipino language, you can say "magandang hapon" to greet someone with "good afternoon."
There is no Antarctic language. One would say 'good afternoon' generally, and have it acknowledged as an afternoon greeting.
Assuming you mean how do you say 'Good afternoon, dear' in another language, you need to state which language you wish it translated to. There are several free translation sites available.
In the Maranao language, "good afternoon" can be translated to "Marhay na aga."
In the Egyptian Arabic dialect, you can say "Sabah el kheir" to greet someone in the afternoon.
In Sesotho language - "Mmoro" and "Mmorong" [plural]
Good afternoon in Hawaiian is expressed as "Aloha awakea."
the word in Indian and/or Pakistani language is dupaaaar
"Roj baΕ" is how you say good afternoon in Kurdish.
good morning: subodhayam శుభోదయం