Topic with Japanese in URL doesn't redirect if URL doesn't perfectly match

[Falco]

@Arta_S and @chrispanag two more fixes incoming, one for long titles and the other for subcategories.

https://github.com/discourse/discourse/commit/2304dcf993f626c86b0cab43d33dc7005e850fb9

and

https://github.com/discourse/discourse/commit/f97b6e85daac2c872a710748dfe004aabb3cff72