first commit

admininistrator/language/en-gb/error/not_found.php

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+<?php
+// Heading
+$_['heading_title']  = 'Page Not Found!';
+
+// Text
+$_['text_not_found'] = 'The page you are looking for could not be found! Please contact your administrator if the problem persists.';

admininistrator/language/en-gb/error/permission.php

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+<?php
+// Heading
+$_['heading_title']   = 'Permission Denied!';
+
+// Text
+$_['text_permission'] = 'You do not have permission to access this page, please refer to your system administrator.';