grammar tweaks for units -- not a rewrite (plus change usage for Thunderer)

data/units/Assassin.cfg

@@ -15,7 +15,7 @@ advanceto=null
 cost=50
 usage=fighter
 ability=skirmisher
-unit_description= _ "Assassins are masters of the night. Like Rogues, they can surround an opponent and backstab him, doing double damage. They can also throw poison-tipped knives at their enemies from long range."
+unit_description= _ "Assassins are masters of the night. Like Rogues, they can surround and backstab an opponent, doing double damage. They can also throw poison-tipped knives at their enemies from long range."
 get_hit_sound=groan.wav
         [death]
                 [frame]
@@ -107,7 +107,7 @@ get_hit_sound=groan.wav
         cost=50
         usage=fighter
         ability=skirmisher
-        unit_description= _ "Assassins are masters of the night. Like Rogues, they can surround an opponent and backstab him, doing double damage. They can also throw poison-tipped knives at their enemies from long range."
+        unit_description= _ "Assassins are masters of the night. Like Rogues, they can surround and backstab an opponent, doing double damage. They can also throw poison-tipped knives at their enemies from long range."
         get_hit_sound=female-hit.wav
                 [attack]
                 name=dagger

data/units/Battle_Princess.cfg

@@ -17,7 +17,7 @@ advanceto=null
 cost=110
 ability=leadership,skirmisher
 usage=fighter
-unit_description= _ "A noble at birth, the Princess has learnt swordplay with the greatest generals, and battle tactics with the greatest sages, making her both a great combatant and leader. Now battle-hardened and strong of will, she can now aid those around her in the art of combat."
+unit_description= _ "A noble by birth, the Princess has learnt swordplay with the greatest generals, and battle tactics with the greatest sages, making her both a great combatant and leader. Now battle-hardened and strong of will, she can now aid those around her in the art of combat."
 get_hit_sound=female-hit.wav
         [death]
                 [frame]
@@ -67,7 +67,7 @@ advanceto=null
 cost=110
 ability=leadership,skirmisher
 usage=fighter
-unit_description= _ "A noble at birth, the Princess has learnt swordplay with the greatest generals, and battle tactics with the greatest sages, making her both a great combatant and leader. The units of lower level around the Princess will fight better due to her presence. The Princess is a skilled skirmisher, and ignores enemy zones of control."
+unit_description= _ "A noble by birth, the Princess has learnt swordplay with the greatest generals, and battle tactics with the greatest sages, making her both a great combatant and leader. Now battle-hardened and strong of will, she can now aid those around her in the art of combat."
 get_hit_sound=female-hit.wav
 	[attack]
 	name=sword

data/units/Bowman.cfg

@@ -15,7 +15,7 @@ advanceto=Longbowman
 undead_variation=archer
 cost=15
 usage=archer
-unit_description= _ "Immersed from childhood in the ways of archery, the young Bowmen are the most common ranged combatants in Wesnothian armies. They do not undergo as rigorous a training as the spearman or heavy infantry, because their battle tactic requires more finess than brute strength."
+unit_description= _ "Immersed from childhood in the ways of archery, the young Bowmen are the most common ranged combatants in Wesnothian armies. They do not undergo as rigorous a training as the spearman or heavy infantry, because their battle tactics require more finesse than brute strength."
 get_hit_sound=groan.wav
         [death]
                 [frame]

data/units/Cockatrice.cfg

@@ -13,7 +13,7 @@ alignment=chaotic
 advanceto=null
 cost=25
 usage=fighter
-unit_description= _ "At first sight, these mystical snake-like creatures appear weak, but looks are deceiving. With just a glance at their enemies, Cockatrices can turn them into stone until the source of their power is destroyed."
+unit_description= _ "At first sight, these mystical snake-like creatures appear weak, but looks are deceiving. With just a glance, Cockatrices can turn their enemies into stone. This enchantment lasts until the source of their power is destroyed."
 
 get_hit_sound=hiss.wav
         [death]

data/units/Deathblade.cfg

@@ -13,7 +13,7 @@ alignment=chaotic
 advanceto=null
 cost=22
 usage=fighter
-unit_description= _ "Deathblades abhor the living and seek to destroy all that they once loved. They are deadly fighters, ignoring all danger to themselves, and caring only about killing as many other as possible with their swirling blades." 
+unit_description= _ "Deathblades abhor the living and seek to destroy all that they once loved. They are deadly fighters, ignoring all danger to themselves, and caring only about killing as many beings as possible with their swirling blades." 
 get_hit_sound=skeleton-hit.wav
 	[resistance]
 		holy=200

data/units/Deathmaster.cfg

@@ -13,7 +13,7 @@ alignment=chaotic
 advanceto=Demilich
 cost=25
 usage=mixed fighter
-unit_description= _ "Gwiti's wanderings on a dark path have given him power normally not granted to mortals, but with a terrible cost: The undead that he gave his soul to are gradually claiming his mortal shell too, and with time, he will be a true undead and a terror to all that lives."
+unit_description= _ "Gwiti's wanderings on a dark path have given him power normally not granted to mortals, but with a terrible cost: the undead that he gave his soul to are gradually claiming his mortal shell too, and with time, he will be a true undead and a terror to all that lives."
 get_hit_sound=groan.wav
         [death]
                 [frame]

data/units/Demilich.cfg

@@ -13,7 +13,7 @@ alignment=chaotic
 advanceto=Dread Lich
 cost=30
 usage=fighter
-unit_description= _ "After too much time dabbling with forbidden magics and dark arts, these mages have begun to pay a heavy price: Demiliches are losing their bodies, becoming undead themselves. With time, they may become fully undead, and feared by all alike." 
+unit_description= _ "After too much time dabbling with forbidden magics and dark arts, these mages have begun to pay a heavy price. Demiliches have started losing their bodies, becoming undead themselves. With time, they may become fully undead, and feared by all alike." 
 get_hit_sound=groan.wav
         [death]
                 [frame]

data/units/Dwarvish_Guardsman.cfg

@@ -19,7 +19,7 @@ alignment=neutral
 advanceto=Dwarvish Stalwart
 cost=19
 usage=fighter
-unit_description= _ "The most resilient dwarves sometimes join the Dwarvish army as Guardsman. Slow and without a strong attack, they guard the Army's flank, soaking up a lot of damage, and hurling their heavy spears into the enemy."
+unit_description= _ "The most resilient dwarves sometimes join the Dwarvish army as Guardsmen. Slow and without a strong attack, they guard the Army's flank, soaking up a lot of damage, and hurling heavy spears for defense."
 get_hit_sound=groan.wav
 
 	[resistance]

data/units/Dwarvish_Thunderer.cfg

@@ -12,7 +12,7 @@ level=1
 alignment=neutral
 advanceto=Dwarvish Thunderguard
 cost=17
-usage=fighter
+usage=mixed fighter
 unit_description= _ "Dwarvish Thunderers provide much needed ranged support to the mighty, yet slow, close-range fighters of the Dwarvish armies. Their mysterious weapons are slower, cruder and noisier than the elegant and swift elvish bows, but their impact is unmatched."
 get_hit_sound=groan.wav
 

data/units/Dwarvish_Ulfserker.cfg

@@ -13,7 +13,7 @@ alignment=neutral
 advanceto=Dwarvish Berserker
 cost=19
 usage=fighter
-unit_description= _ "Dwarves are an ancient race of powerful fighters. Ulfserkers are the most ferocious of these in battle: they attack without stopping fighting until either their enemy or they are dead, no matter how many wounds they receive."
+unit_description= _ "Dwarves are an ancient race of powerful fighters. Ulfserkers are the most ferocious of these in battle: they persist until either their enemy is dead or they themselves perish, no matter how many wounds they receive."
 get_hit_sound=groan.wav
 	[defense]
 	hills=60

data/units/Necromancer.cfg

@@ -13,7 +13,7 @@ alignment=chaotic
 advanceto=Lich,Dark Sorcerer
 cost=38
 usage=mixed fighter
-unit_description= _ "Necromancer are Mages that have decided to follow the paths of the dark arts. By tapping into the power of the undead, Necromancers can cast spells that drain the lifeforce from their foes and add it to their own."
+unit_description= _ "Necromancers are Mages that have decided to follow the paths of the dark arts. By tapping into the power of the undead, Necromancers can cast spells that drain the lifeforce from their foes and add it to their own."
 get_hit_sound=groan.wav
 	[attack]
 	name=staff

data/units/Orcish_Leader.cfg

@@ -15,7 +15,7 @@ alignment=chaotic
 advanceto=Orcish Ruler
 cost=120
 usage=mixed fighter
-unit_description= _ "Orcish Rulers are the chiefs of their tribe. They make the important decisions and lead their people into battle. They carry a bow out of necessity, but are much more skilled with the sword; all in all, they are powerful fighters. Their natural leadership skills make them very precious in the battle: if the Ruler is lost, so is the battle."
+unit_description= _ "Orcish Leaders are the chiefs of their tribe. They make the important decisions and lead their people into battle. They carry a bow out of necessity, but are much more skilled with the sword; all in all, they are powerful fighters. Their natural leadership skills make them very precious in battle: if the Leader is lost, so is the battle."
 get_hit_sound=orc-hit.wav
 	[attack]
 	name=sword

data/units/Orcish_Ruler.cfg

@@ -15,7 +15,7 @@ alignment=chaotic
 advanceto=Orcish Sovereign
 cost=120
 usage=mixed fighter
-unit_description= _ "Orcish Rulers are the chiefs of their tribe. They make the important decisions and lead their people into battle. They carry a bow out of necessity, but are much more skilled with the sword; all in all, they are powerful fighters. Their natural leadership skills make them very precious in the battle: if the Ruler is lost, so is the battle."
+unit_description= _ "Orcish Rulers are the chiefs of their tribe. They make the important decisions and lead their people into battle. They carry a bow out of necessity, but are much more skilled with the sword; all in all, they are powerful fighters. Their natural leadership skills make them very precious in battle: if the Ruler is lost, so is the battle."
 get_hit_sound=orc-hit.wav
 	[attack]
 	name=sword

data/units/Orcish_Sovereign.cfg

@@ -15,7 +15,7 @@ alignment=chaotic
 advanceto=null
 cost=120
 usage=mixed fighter
-unit_description= _ "Orcish Sovereign are the chiefs of their tribe. They make the important decisions and lead their people into battle. They carry a bow out of necessity, but are much more skilled with the sword; all in all, they are powerful fighters. Their natural leadership skills make them very precious in the battle: if the Ruler is lost, so is the battle."
+unit_description= _ "Orcish Sovereigns are the chiefs of their tribe. They make the important decisions and lead their people into battle. They carry a bow out of necessity, but are much more skilled with the sword; all in all, they are powerful fighters. Their natural leadership skills make them very precious in battle: if the Sovereign is lost, so is the battle."
 get_hit_sound=orc-hit.wav
 	[attack]
 	name=sword