Make config.php template ASCII text.

There's little to no added value for UTF-8 in this file, while some
editors do cause trouble when editing those files (e.g. adding BOM
on Windows). This just avoids that hassle where we can.

Closes: #1432

config-templates/config.php

@@ -751,7 +751,7 @@ $config = [
          * ],
          *
          * establishing that if a translation for the "no" language code is
-         * not available, we look for translations in "nb" (Norwegian Bokmål),
+         * not available, we look for translations in "nb",
          * and so on, in that order.
          */
         'priorities' => [
@@ -971,7 +971,7 @@ $config = [
             'type'          => 'saml20-idp-SSO',
         ],
 
-        /* When called without parameters, it will fallback to filter attributes ‹the old way›
+        /* When called without parameters, it will fallback to filter attributes 'the old way'
          * by checking the 'attributes' parameter in metadata on IdP hosted and SP remote.
          */
         50 => 'core:AttributeLimit',