Add the updated Dunefolk race description.

See: https://forums.wesnoth.org/viewtopic.php?f=32&t=47721&start=375#p624668
[ci skip]

(cherry-picked from commit 3b5cbc3e3c)

data/core/units.cfg

@@ -207,7 +207,17 @@ The eastern provinces of Wesnoth, known as the Clan Homelands, have a geography
         male_name= _"race^Dunefolk Human"
         female_name= _"race+female^Dunefolk Human"
         plural_name= _"race+plural^Dunefolk"
-        description= _"The Dunefolk are a human culture inhabiting the dry deserts in the southern region of the Great Continent."
+        description= _"An offshoot of a forgotten nomadic civilization, the Dunefolk lay claim to the river valleys and oases of the Sandy Wastes. How they came to inhabit this far corner of the Great Continent is unknown. Their legends tell of many long and perilous travels through far-flung lands, but the true origin of their people is a topic of endless and heated debate among even the most erudite of their scholars.
+
+Whatever their origin, the Dunefolk have thrived. Bustling cities stand proudly in the largest fertile regions. Skilled artisans, fine smiths, and wealthy merchants form the backbone of the urban economy. Each of these cities also enjoys a degree of independence less common in the more centralized nations to the north, many even maintaining their own standing armies. In times of need, however, each and all rally to a higher authority designated to protect the superior interest of the nation.
+
+Those who have not settled in these urban centers still adhere to the lifestyle of their ancestors, roaming the dunes and leading their herds from one watering hole to another. They are most active during the early hours of dawn and the onset of dusk, when the wastelands are neither too hot nor too cold. Their skill at moving through the sands is excellent even by Dunefolk standards. Although sometimes regarded with contempt by their city counterparts, they provide an invaluable service as mobile, light troops in war, or as escorts for trading caravans during times of peace.
+
+The Dunefolk's inclination towards trade and exploration has allowed their cities to amass immense fortunes, a fact regarded both with admiration and envy by other races. Mutual interests have fostered cordial relations with neighboring Naga tribes, but more secretive races such as Drakes and Elves have always considered Dunefolk expeditions to be too intrusive, especially when they venture close to territorial boundaries. It is not uncommon for caravans to fall prey to troll ambushes in the mountains, something that has given rise to countless tales of unimaginable treasure amassed in hidden caves.
+
+As a result of living in hostile environments for centuries, the Dunefolk have developed rational methods of enquiry through which they continue to improve their understanding of the world. Their study of herbal medicine keeps their warriors and workers fresh and healthy. Their knowledge of alchemy allows them to tame fire and wield it as a deadly weapon in battle. At the same time, this analytical mindset has distanced them from magical arts; to the rational mind, magic is uncontrollable, unpredictable, and hence unreliable. For this reason, the Dunefolk especially loathe the perversions of necromancy and the dark arts, even moreso than other races.
+
+The Dunefolk's inquisitive and explorative nature does not preclude military strength. Not only do they field nimble light troops, cataphracts, and heavily armored infantry, but their keen knowledge of technology grants them a decisive advantage over their opponents. When facing the Dunefolk in battle, however, the most fearsome sight is certainly their deployment of ferocious and bizarre beasts. From the majestic Roc to the imposing Wyvern, their synergy with these creatures allows for great versatility in combat. The origins of this tradition likely lie in the heritage of the Dunefolk's distant past in the exotic far corners of Irdya."
         num_traits=2
         markov_chain_size=2
         # wmlscope: start ignoring