Fix warnings and code cleanup/fixes (#13570)

Content.Shared/Localizations/ContentLocalizationManager.cs

@@ -100,7 +100,7 @@ namespace Content.Shared.Localizations
                 iargs[i - 2] = n;
             }
 
-            if (!ut!.TryGetUnit(max, out var mu))
+            if (!ut.TryGetUnit(max, out var mu))
                 throw new ArgumentException("Unit out of range for type");
 
             var fargs = new object[iargs.Length];

Content.Shared/Localizations/Units.cs

@@ -1,4 +1,5 @@
 using System.Diagnostics.CodeAnalysis;
+using System.Globalization;
 
 namespace Content.Shared.Localizations
 {
@@ -51,9 +52,9 @@ namespace Content.Shared.Localizations
             public string Format(double val)
             {
                 if (TryGetUnit(val, out var w))
-                    return (val * w.Factor).ToString() + " " + Loc.GetString("units-" + w.Unit);
+                    return (val * w.Factor) + " " + Loc.GetString("units-" + w.Unit);
 
-                return val.ToString();
+                return val.ToString(CultureInfo.InvariantCulture);
             }
 
             public string Format(double val, string fmt)
@@ -130,11 +131,11 @@ namespace Content.Shared.Localizations
 
         public readonly static Dictionary<string, TypeTable> Types = new Dictionary<string, TypeTable>
         {
-            ["generic"] = Generic!,
-            ["pressure"] = Pressure!,
-            ["power"] = Power!,
-            ["energy"] = Energy!,
-            ["temperature"] = Temperature!
+            ["generic"] = Generic,
+            ["pressure"] = Pressure,
+            ["power"] = Power,
+            ["energy"] = Energy,
+            ["temperature"] = Temperature,
         };
     }
 }