Add Search Index Progress Bar with Stats

This is what it will look like :

ScreenShot:
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1st run (On Submit) :

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2nd & consecutive run (On each Refresh) :

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Continue to run (In-case the Indexing was Interrupted) :

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Changes :

• Update SQL for count of posts
• Update search index test
• Removed "Pop-up Progress Bar".
• For first run display the "Success Message".
• Display the Info from "Pop-up Progress Bar" to "Success Message".
• Only display "Redirect" & "Rate" of post refreshed "Success Message".
• Minor Language Fix.
• Use ORDER BY post_id ASC for progress stats.
• Removed HTML from Lang String.
• Moved HTML to PHP file.
• Increased the size of Progress-Bar by 2x.

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Best regards