Audit culture bugs (#7707)

* Added comments and fixed CultureInfo /  StringComparison where appropriate

* Addressed comments

* Fixed comment

src/modules/launcher/Plugins/Microsoft.Plugin.Calculator/CalculateEngine.cs

@@ -15,6 +15,7 @@ namespace Microsoft.Plugin.Calculator
 
         public CalculateResult Interpret(string input)
         {
+            // Using CurrentCulture this is user facing
             return Interpret(input, CultureInfo.CurrentCulture);
         }
 

src/modules/launcher/Plugins/Microsoft.Plugin.Calculator/Main.cs

@@ -35,6 +35,7 @@ namespace Microsoft.Plugin.Calculator
 
             try
             {
+                // Using CurrentUICulture since this is user facing
                 var result = CalculateEngine.Interpret(query.Search, CultureInfo.CurrentUICulture);
 
                 // This could happen for some incorrect queries, like pi(2)

src/modules/launcher/Plugins/Microsoft.Plugin.Calculator/ResultHelper.cs

@@ -27,6 +27,7 @@ namespace Microsoft.Plugin.Calculator
 
             return new Result
             {
+                // Using CurrentCulture since this is user facing
                 Title = roundedResult?.ToString(CultureInfo.CurrentCulture),
                 IcoPath = iconPath,
                 Score = 300,
@@ -45,6 +46,7 @@ namespace Microsoft.Plugin.Calculator
                 {
                     try
                     {
+                        // Using CurrentUICulture since this is user facing
                         Clipboard.SetText(roundedResult?.ToString(CultureInfo.CurrentUICulture.NumberFormat));
                         ret = true;
                     }