Core/Chat: Allow incorrect spell/skill language assignments to mirror client behavior

Port From (https://github.com/TrinityCore/TrinityCore/commit/14098b28b39bc9d1ea17d18a7ecd3dd610f29cdc)

Source/Game/Globals/ObjectManager.cs

@@ -10887,6 +10887,36 @@ namespace Game
     {
         public uint SpellId;
         public uint SkillId;
+
+        public LanguageDesc() { }
+        public LanguageDesc(uint spellId, uint skillId)
+        {
+            SpellId = spellId;
+            SkillId = skillId;
+        }
+
+        public override int GetHashCode()
+        {
+            return SpellId.GetHashCode() ^ SkillId.GetHashCode();
+        }
+
+        public override bool Equals(object obj)
+        {
+            if (obj is LanguageDesc)
+                return (LanguageDesc)obj == this;
+
+            return false;
+        }
+
+        public static bool operator ==(LanguageDesc left, LanguageDesc right)
+        {
+            return left.SpellId == right.SpellId && left.SkillId == right.SkillId;
+        }
+
+        public static bool operator !=(LanguageDesc left, LanguageDesc right)
+        {
+            return !(left == right);
+        }
     }
 
     class ItemSpecStats