Update Edit and Continue analyzers to use resource strings

src/EditorFeatures/CSharpTest/EditAndContinue/RudeEditStatementTests.cs

@@ -3054,7 +3054,7 @@ static void F()
             var edits = GetTopEdits(src1, src2);
 
             edits.VerifySemanticDiagnostics(
-                Diagnostic(RudeEditKind.InsertLambdaWithMultiScopeCapture, "x0", "lambda", "x1", "x0")
+                Diagnostic(RudeEditKind.InsertLambdaWithMultiScopeCapture, "x0", CSharpFeaturesResources.Lambda, "x1", "x0")
                 );
         }
 

src/EditorFeatures/CSharpTest/EditAndContinue/RudeEditTopLevelTests.cs

@@ -4053,7 +4053,7 @@ public void Insert_ExternConstruct()
                 "Insert [()]@25");
 
             edits.VerifyRudeDiagnostics(
-                Diagnostic(RudeEditKind.InsertExtern, "public extern C()", "constructor"));
+                Diagnostic(RudeEditKind.InsertExtern, "public extern C()", FeaturesResources.Constructor));
         }
 
         #endregion