Button order in "New Post" is inconsistent with other modules

[Remy Blank]

At the bottom of the "New Post" page for creating a new post, the buttons are in the following order:

• Save Post
• Preview Post
• Cancel

This is inconsistent with other Trac modules, where "Preview" is always first. For example, when editing a wiki page:

• Preview Page
• Review Changes
• Submit Changes
• Cancel

Or when entering a ticket:

• Preview
• Create ticket

So "Preview Post" should come first, followed by "Save Post" and "Cancel". I can provide a patch if desired.

[osimons]

(In [4132]) FullBlogPlugin: Adjusting order of buttons and cleaning up some terms and casing for text inside them.

Closes #3535.