cap fixes in mw_editpost

[nprasath002]

the patch includes

• moved the cap check below post type check (first we need to check the post type for capability check)
• expand the cap check for pages
• check cap for publishing post or setting it as private with post_ID

The checks were ok in 3.3 but changed in the trunk which breaks support for 'pages'.

[SergeyBiryukov]

__( "Sorry, you do not have the right to edit this {$post_type}." )

A dynamic string like that is not translatable, see #19099 or #20005 for example.

[nprasath002]

Just replaced the dynamic strings with post.
A more elaborate error message needs more boilerplate code.
I am not sure we need this?

[SergeyBiryukov]

I'd suggest "You are not allowed to edit this item", which is already used in several files:
​http://core.trac.wordpress.org/browser/tags/3.3.1/wp-admin/post.php#L137

[markoheijnen]

Related ticket #20336

[ryan]

publish_$post_type caps do not exist.

[ryan]

And edit_post handles any post type. Since the allowed post types are limited to post and page, I don't think we need to make any changes here.