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Given that Gandalf admits he really doesn't know much dwarfish, his reaction to what Ori wrote could simply have boiled down to "AT LAST, some part I can READ"
As for why the book isn't mentioned again, the fact that it was no longer relevant to the story is the most likely. But an alternate explanation may be that the rest of the book never got read because it couldn't. If the book was already so aged and in such poor condition that Gandalf had to be careful as he read lest the pages crumble, I would question how well it would LAST on the rough and tumble journey Gimli went through. Unless Gimli actually left the book in Lothlorien with the elves for them to carry to the dwarves (which seems massively unlikely, given how the average elf feels about the average dwarf and how well an elven messenger could expect to be received by Dain's court) or in Rohan (more or less the same sorts of problems) the book may have been dust long before Gimli ever got to read the rest, or get it into the hands of someone who could.
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