#538: Delete all reports

"Delete All" subtab add to the reports tab so superadmins can delete all
reports from database.

TODO: Have to style page properly. Still a noobie, already made a mess
today, couldn't figure out how to generate translation files and decided
to take it easy. :)
Updating code to handle localizations
Making it so only superadmins can delete all report
Renaming files according to standard
Updating permission to delete all reports
Updating SQLs with new permission
Updating DB queries to truncate data
Simplifying $_POST check
Fix delete all link
Add localizations for delete all reports fn