Typo, redundant string interpolation, namespaces and imports cleanup (#2068)

* Readonly, typos and redundant string interpolations

* Namespaces

* Optimize imports

* Address reviews

* but actually

* Localize missing strings

* Remove redundant vars

Content.Server/GameObjects/Components/Damage/DamageCommands.cs

@@ -156,6 +156,7 @@ namespace Content.Server.GameObjects.Components.Damage
         public string Command => "godmode";
         public string Description => "Makes your entity or another invulnerable to almost anything. May have irreversible changes.";
         public string Help => $"Usage: {Command} / {Command} <entityUid>";
+
         public void Execute(IConsoleShell shell, IPlayerSession? player, string[] args)
         {
             IEntity entity;