Adding some missing random map previews

This was SVN commit r12302.

binaries/data/mods/public/art/textures/ui/session/icons/mappreview/lake.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:1ef835a518736e2b7d24f252ca3b6a72af29679cb640c2f2e12be4338e74f1eb
-size 106459
+oid sha256:6741bf91d14138d470897e0d738e053a5d16726428ed347d5aa77505e267f42b
+size 143370

binaries/data/mods/public/maps/random/lorraine_plain.json

@@ -5,6 +5,7 @@
 		"Description" : "Players start in a nearly flat plain divided by a river and its tributaries\n\n\nThe borders of the area called Lorraine changed much in its long history. In 843, Charlemagne had died, and the Holy Roman Empire was divided among his three grandsons. One of them was Lothair, and his realm, reaching from Frisia to Rome, was called Lotharingia. Most of the region which was later named Lorraine forms part of the Paris Basin, with a plateau relief cut by river valleys presenting cuestas in the north-south direction. The eastern part is sharper with the Vosges Mountains. Many rivers run through Lorraine, including Moselle, Meurthe, and Meuse. Most of them are on the Rhine drainage basin.",
 		"BaseTerrain" : ["temp_grass_long"],
 		"BaseHeight" : 3,
+		"Preview" : "lorraine_plain.png",
 		"CircularMap" : true,
 		"XXXXXX" : "Optionally define other things here, like we would for a scenario"
 	}