A lot has changed since D1377/rP22137 was committed, and some loading screen tips are now incorrect. This patch partially rewrites those of the barracks, forge, and fortress.
Furthermore, the “trade commercial treaty” technology's description has been replaced, to better explain the international bonus. The “unlock shared dropsites” and “unlock shared vision” technologies also receive new descriptions, to better justify their effects.
The latter is also renamed from “cartography” to “messengers”. Nowadays people are so used to maps that it's easy to forget how conceptually challenging they really are. Although maps gradually emerged during antiquity, they were never common, the usable maps that did exist were more something of Roman times (the //Tabula Peutingeriana// is probably the most famous) and looked quite different from ours. Cartography as we know it really took off in the early modern period.