deprecated loadtab.php

fixes #499
hotfixing #500 cherrypicked
fix for content filter twice on page id check
returnpagecontent paramter to skip filters
Added salt safeties to install.php
Will kill if authorization fails to save.
Will kill if SALT is empty.
added tranlation for unsaved pages
updated header of lang file
Merge branch 'hotfixes'

Conflicts:
	admin/edit.php
	admin/inc/caching_functions.php
	admin/lang/en_US.php
	admin/loadtab.php