Remove period from error message

src/Compilers/CSharp/Portable/CSharpResources.Designer.cs

@@ -9854,7 +9854,7 @@ internal class CSharpResources {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to {0} &apos;{1}&apos; is not a valid C# conversion expression..
+        ///   Looks up a localized string similar to {0} &apos;{1}&apos; is not a valid C# conversion expression.
         /// </summary>
         internal static string IConversionExpressionIsNotCSharpConversion {
             get {

src/Compilers/CSharp/Portable/CSharpResources.resx

@@ -5109,6 +5109,6 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
     <value>Unable to read debug information of method '{0}' (token 0x{1:X8}) from assembly '{2}'</value>
   </data>
   <data name="IConversionExpressionIsNotCSharpConversion" xml:space="preserve">
-    <value>{0} '{1}' is not a valid C# conversion expression.</value>
+    <value>{0} '{1}' is not a valid C# conversion expression</value>
   </data>
 </root>
\ No newline at end of file

src/Compilers/VisualBasic/Portable/VBResources.Designer.vb

@@ -12235,7 +12235,7 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         End Property
         
         '''<summary>
-        '''  Looks up a localized string similar to {0} &apos;{1}&apos; is not a valid Visual Basic conversion expression..
+        '''  Looks up a localized string similar to {0} &apos;{1}&apos; is not a valid Visual Basic conversion expression.
         '''</summary>
         Friend ReadOnly Property IConversionExpressionIsNotVisualBasicConversion() As String
             Get

src/Compilers/VisualBasic/Portable/VBResources.resx

@@ -5501,6 +5501,6 @@
     <value>Unable to read debug information of method '{0}' (token 0x{1}) from assembly '{2}'</value>
   </data>
   <data name="IConversionExpressionIsNotVisualBasicConversion" xml:space="preserve">
-    <value>{0} '{1}' is not a valid Visual Basic conversion expression.</value>
+    <value>{0} '{1}' is not a valid Visual Basic conversion expression</value>
   </data>
 </root>
\ No newline at end of file