In the back of the *Strawberry Panic Complete Novel Collection* there is a "Translation Notes" section explaining some of the terms like *genpaku*, *mogi* (Japanese) and *financier* (French), but it also talked about what the *Taisho Era* is, which, unlike the other 3 I mentioned, is a historic thing rather than something from another language.

I am wondering if this kind of translation notes can also be used for a story set in a fictional world. If so with these 3 examples is there any I should/shouldn't use?

Example 1: fictional term

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> Danse de l'Ange: a hit novel series set during Heaven's Fall following the tales of Aurica le'Divant, speculating on her own previously unknown involvement in it. It is french for *The Angel's Dance*1
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Example 2: Real World term with retained meaning (though in-story origin is different)

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> Kosode (Real World): a basic japanese robe worn as either an overgarment or undergarment
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> Kosode (In Story): a basic robe worn as either an overgarment or undergarment originating from Nipon
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Example 3: Real World Term with a different meaning

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> Okami (Real World): a Japanese term meaning *Great God*2
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> Okami (In-Story): A term in Shinto to refer to Izanami's 2 eldest daughters, Amaterasu-no-Mikoto and Tsukimara-no-Mikoto. The use of the term itself locally (Okami-sama) in Nipon or Ohana refers to that country's Okami (Amaterasu and Tsukimara respectively) while it can also used be used as an honorific for either of them (Amaterasu-okami, Tsukimara-okami).
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NOTE: The (In Story) ones are what I would show. The (Real World) ones are just to compare to for the sake of this question.

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1: according to [google translate](https://translate.google.com.au/?um=1&ie=UTF-8&hl=en&client=tw-ob#auto/fr/The%20Angel%27s%20Dance)

2: according to [this](http://www.gamefaqs.com/boards/945498-shin-megami-tensei-persona-4/48672121)