Issue #27365: Allow non-ascii in idlelib/NEWS.txt - minimal part for 3.5.2.

Lib/idlelib/NEWS.txt

@@ -30,7 +30,7 @@ What's New in IDLE 3.5.2?
   Original patch by Saimadhav Heblikar.
 
 - Issue #18410: Add test for IDLE's search dialog.
-  Original patch by Westley Martínez.
+  Original patch by Westley Martínez.
 
 - Issue #21703: Add test for undo delegator.
   Original patch by Saimadhav Heblikar .
@@ -48,7 +48,7 @@ What's New in IDLE 3.5.2?
 - Issue #25507: fix incorrect change in IOBinding that prevented printing.
   Augment IOBinding htest to include all major IOBinding functions.
 
-- Issue #25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
+- Issue #25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
   MARK in README.txt and open this and NEWS.txt with 'ascii'.
   Re-encode CREDITS.txt to utf-8 and open it with 'utf-8'.
 

Lib/idlelib/aboutDialog.py

@@ -130,7 +130,7 @@ class AboutDialog(Toplevel):
         self.display_file_text('About - Readme', 'README.txt', 'ascii')
 
     def ShowIDLENEWS(self):
-        self.display_file_text('About - NEWS', 'NEWS.txt', 'ascii')
+        self.display_file_text('About - NEWS', 'NEWS.txt', 'utf-8')
 
     def display_printer_text(self, title, printer):
         printer._Printer__setup()