The OP never indicated the need for the languages he only asked for a list. The only reason I can think of for needing a complete list vs knowing if a particular language is supported is developing a reading (or writing) app.
Also, any decent reader should support embedded fonts. Other than RTL pretty much any reader can display any language if the fonts are included in the EPUB itself. Pretty much any language (even if it isn't on the official list) is supported as long as it can be encoded in utf-8 or utf-16 and a font is included.
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