Incorrect text under Comment publish/approval's description and Deleting Comment Refreshes Page to "Published" Tab

Hi,

I'm using comment module to moderate the comment in my site. So when the module is enable, I visit:
1. admin/content/comment/approval

The text says: "Below is a list of the comments posted to your site that need approval. To approve a comment, click on 'edit' and then change its 'moderation status' to Approved. Click on a subject to see the comment, the author's name to edit the author's user information, 'edit' to modify the text, and 'delete' to remove their submission."

But

- There is no "Delete" to click to remove their submission on the "Moderate Comments - Approval Queue" page

- if you click on Edit... there is no "moderation status" to change on the Edit Page.
See image-1.jpg

So I suggest to change this text to:
"Below is a list of the comments posted to your site that need approval. To approve a comment, click on 'moderate' and then 'publish' or 'publish and reply'. Click on a subject to see the comment, the author's name to edit the author's user information, and 'edit' to modify the text. In addition, you can select the update options from select list to unpublish or delete the selected comments."

2. admin/content/comment
The text says: "Below is a list of the latest comments posted to your site. Click on a subject to see the comment, the author's name to edit the author's user information, 'edit' to modify the text, and 'delete' to remove their submission."

But:
the page does not offer a "Delete" button to "remove their submission."
See image-2.jpg

I suggest to change this text to:
"elow is a list of the latest comments posted to your site. Click on a subject to see the comment, the author's name to edit the author's user information, and 'edit' to modify the text. In addition, you can select the update options from select list to unpublish or delete the selected comments."

3. Deleting a comment in the Moderate Comments area under the approval queue tab causes the page to refresh to the "Published" Tab... should remain on the Approval Queue tab.

For 1 and 2, I submit a patch attached. I'm not experience in patch, so just follow a basic step to create this patch. For 3, I think we have to modify the value of $form_state['redirect'] under comment_confirm_delete_submit() function of comment.admin.inc. I don't know what is the best practice to modify this.

Thanks
Truyenle