There is no language called "Muslim". Muslims typically use Arabic-language greetings when meeting one another.
The typical evening greeting is: Assalam-o-Alaikum wa Rahmat Ullah wa Barakato hoo (May Almighty Allah send His Blessings, Mercy and Peace upon you.)
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."
The Egyptian language is Arabic. In Arabic, good afternoon is said: masaa alkher
Good afternoon in Hawaiian is expressed as "Aloha awakea."
In Sesotho language - "Mmoro" and "Mmorong" [plural]
the word in Indian and/or Pakistani language is dupaaaar
"Roj baş" is how you say good afternoon in Kurdish.
good morning: subodhayam శుభోదయం