Issue #2626716 by jacktonkin, MaskOta, tedbow, michielnugter, ozin, dawehner, swetashahi, una_maria, zviryatko, mohit_aghera, kryp71c, Jo Fitzgerald, Munavijayalakshmi, Truptti, droplet, andrewmacpherson: "Edit Summary" link not showing if "Help Text" is set

Issue #2802403 by _Archy_, Berdir, rjay, catch, Tachion, jacktonkin, oriol_e9g, willwh, tameeshb, dawehner, dhansen, bmcclure, DeFr, david.gil, gagarine, plach: Combination of language negotiation and path aliasing can cause a corrupted route cache, 404s