Slightly improve the saving of novels in Epub.

[VectorNEON]

Describe your suggested feature

When you try to save a novella, for example, with the title "Mythical Spirit: Chronicles (Novel)" in Epub, this will not work due to the invalid ":" character for file names. To do this, you have to change the name in the library, which is not very convenient and ugly.
So here’s what I’m getting at: we need to add the ability to select when saving an Epub not only the save path, but also the name of the Epub being saved, without changing its name in the library due to the lack of this feature.

Other details

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