Comments are auto-closed on older Pages

[nao]

When you set auto-closing of the comments on old posts (referred as "articles" on the Settings > Discussion screen), comments on older Pages are closed as well.

To reproduces:

1. Create a Page titled "Old Page", backdate it (older than 14 days) and publish.
2. Create a Page titled "New Page" and publish it.
3. Go to Settings > Discussion and check the box next to "Automatically close comments on articles older than 14 days"
4. "Old Page" will lose the comment form, while New Page doesn't.

Suggestion:

• Do not close comments on Pages even if they are old.
• Change the label "Automatically close comments on articles older than X days" to say "Automatically close comments on Posts older than X days".

[nao]

Reproduced in version 3.0.4 as well as in 3.1-beta2-16997.

[ocean90]

#16090 has a patch.