"Now the various species of whales need some sort of popular comprehensive classification, if only an easy outline one for the present, hereafter to be filled in all its departments by subsequent laborers. As no better man advances to take this matter in hand, I hereupon offer my own poor endeavors. I promise nothing complete; because any human thing supposed to be complete, must for that very reason infallibly be faulty."
And, there are plenty of logics that are complete, like presberger arithmetic; these logics just happen to be weaker than first-order arithmetic.
But Poincare's writings on the philosophy of mathematics and science are really excellent.
In French, most of Poincare's original works can be read here;
I recommend "Reflections on Relativity" if you need a concrete starting place. Here on HN over the years I have wished it would be published at various times, but I am now happy to say I have a physical copy, despite having read it online at least three times before. It was worth it just to see it typeset properly.
I was fully able to write both Gödel and Poincaré with both 8859-1 and HTML entities and in both WordPerfect and Word back in the 90's (the current version of the page is generated by Microsoft Word 10).
The problem is not unicode but the fact that it was written by an American/someone who is rather sloppy with names. For example, he writes "Paul Von Hindenberg" when he means "Paul von Hindenburg". Things like that are trivial to get right unless one actually doesn't care.