The possible values of the layout style parameter for the Container macro should not be translated in the field description

The English description of the layout style parameter for the container macro is:
"The style of the container layout (e.g. columns)."
while its French translation is
"Le type de mise en page du containeur (ex: colonnes)."

These descriptions are visible from the Wysiwyg's macro wizard.

There are 2 things to be fixed:

1. The French translation should leave the "columns" identifier unchanged, since that is the value to be filled in for this parameter in order for the container macro to have a proper columns layout.
2. To make it easier to understand and prevent these situations in other languages, the description should make it more obvious that "columns" is the actual value to be filled in for the layout style parameter.