display dehydration status in the status table

data/campaigns/Under_the_Burning_Suns/utils/dehydration-utils.cfg

@@ -182,6 +182,29 @@ Hd, Dd*, Rd #enddef
 # Events
 #
 
+[event]
+    name=preload
+    first_time_only=no
+    [lua]
+        code=<<
+            local _ = wesnoth.textdomain "wesnoth-utbs"
+            local old_unit_status = wesnoth.theme_items.unit_status
+            function wesnoth.theme_items.unit_status()
+                local u = wesnoth.get_displayed_unit()
+                if not u then return {} end
+                local s = old_unit_status()
+                if u.status.dehydrated then
+                    table.insert(s, { "element", {
+                        image = "misc/dehydration-status.png",
+                        tooltip = _"dehydrated: This unit is dehydrated. It will lose 4 HP and have its damage reduced by 1 each turn during the day unless prevented by healers or cured by water at an oasis.\n\nUnits cannot be killed or deal no damage as a result of dehydration."
+                    } })
+                end
+                return s
+            end
+        >>
+    [/lua]
+[/event]
+
 [event]
     name=prestart