Fix atmos UI decimal separator bug (#23009)

* Fix atmos UI inconsistent culture usage

* Remove the need to pass localization manager

Content.Shared/Localizations/UserInputParser.cs

@@ -0,0 +1,54 @@
+using System.Globalization;
+
+namespace Content.Shared.Localizations;
+
+/// <summary>
+/// Helpers for user input parsing.
+/// </summary>
+/// <remarks>
+/// A wrapper around the <see cref="System.Single.TryParse(string, out float)"/> API,
+/// with the goal of trying more options to make the user input parsing less restrictive.
+/// For culture-invariant parsing use <see cref="Robust.Shared.Utility.Parse"/>.
+/// </remarks>
+public static class UserInputParser
+{
+    private static readonly NumberFormatInfo[] StandardDecimalNumberFormats = new[]
+    {
+        new NumberFormatInfo()
+        {
+            NumberDecimalSeparator = "."
+        },
+        new NumberFormatInfo()
+        {
+            NumberDecimalSeparator = ","
+        }
+    };
+
+    public static bool TryFloat(ReadOnlySpan<char> text, out float result)
+    {
+        foreach (var format in StandardDecimalNumberFormats)
+        {
+            if (float.TryParse(text, NumberStyles.Integer | NumberStyles.AllowDecimalPoint, format, out result))
+            {
+                return true;
+            }
+        }
+
+        result = 0f;
+        return false;
+    }
+
+    public static bool TryDouble(ReadOnlySpan<char> text, out double result)
+    {
+        foreach (var format in StandardDecimalNumberFormats)
+        {
+            if (double.TryParse(text, NumberStyles.Integer | NumberStyles.AllowDecimalPoint, format, out result))
+            {
+                return true;
+            }
+        }
+
+        result = 0d;
+        return false;
+    }
+}