MDL-12656 indicate when current value is incorrect and propose default instead in admin settings; merged from MOODLE_19_STABLE

lang/en_utf8/admin.php

@@ -697,6 +697,7 @@ $string['uuupdatefromfile'] = 'Override with file';
 $string['uuupdatemissing'] = 'Fill in missing from file and defaults';
 $string['uuupdatetype'] = 'Existing user details';
 $string['validateerror'] = 'This value was not valid:';
+$string['warningcurrentsetting'] = 'Invalid current value: $a';
 $string['xmlstrictheaders'] = 'XML strict headers';
 
 ?>

theme/standard/styles_color.css

@@ -339,7 +339,11 @@ table.flexible .r1 {
 }
 
 #adminsettings .form-overridden {
-    background-color: #fbb;
+    background-color: #ff6;
+}
+
+#adminsettings .form-warning {
+    background-color: #f88;
 }
 
 #adminsettings .form-item .defaultinfo {

theme/standard/styles_fonts.css

@@ -271,6 +271,11 @@ body#admin-index .copyright {
   font-size: 0.9em;
 }
 
+#adminsettings .form-warning,
+#adminsettings .form-overridden {
+  font-size: 0.8em;
+}
+
 /***
  *** Blocks
  ***/