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Spell in Original Astaerin:
Femedatosqu talie Kadetsokqu ey
Sis vilies neuman a'olin ledacoum
Sya sacein matei hagisiyla...
English (Or as close as possible)
Oh Great Lady Femedatos and Lord Kadetsok*
Lend me your great powers
Activate, my magic circle...
Oh, a couple of different languages. Saying who or what speaks those languages wouldn't be very helpful without an extremely long-winded explanation of their ethnic identities.
I didn't. Readers don't give a shit about my made-up language. If anything, it's a huge pain in the arse, for example, if I know that my character's language's grammar requires them to provide information that will not be provided in the English translation, or vice versa.
Quite a lot. They've got their alphabets and writing systems, vocabularies, unique grammar, and even different dialects based on region and time period.
Have some shittily transliterated translations, using your phrase, "He is the man who killed the civilian long ago."