Removed PHP_SELF checking in sub_language management (used better mechanism)

main/admin/sub_language.php

@@ -4,6 +4,7 @@
 // name of the language file that needs to be included
 $language_file = 'admin';
 $cidReset = true;
+$this_script = 'sub_language';
 require_once '../inc/global.inc.php';
 require_once 'sub_language.class.php';
 $this_section = SECTION_PLATFORM_ADMIN;

main/admin/sub_language_ajax.inc.php

@@ -1,6 +1,7 @@
 <?php
 /* For licensing terms, see /license.txt */
 $language_file = 'admin';
+$this_script = 'sub_language';
 require_once '../inc/global.inc.php';
 require_once 'sub_language.class.php';
 
@@ -41,4 +42,4 @@ if (isset($new_language) && isset($language_variable) && isset($file_id)) {
 	} else {
 	    echo 1;
 	}	
-}
+}

main/inc/global.inc.php

@@ -395,7 +395,7 @@ if (!empty($_POST['language_list'])) {
 $langpath = api_get_path(SYS_LANG_PATH);
 
 /* This will only work if we are in the page to edit a sub_language */
-if (api_get_self() == api_get_path(REL_PATH).'main/admin/sub_language.php' || api_get_self() == api_get_path(REL_PATH).'main/admin/sub_language_ajax.inc.php') {
+if (isset($this_script) && $this_script == 'sub_language') {
     require_once '../admin/sub_language.class.php';
     // getting the arrays of files i.e notification, trad4all, etc
     $language_files_to_load = SubLanguageManager:: get_lang_folder_files_list(api_get_path(SYS_LANG_PATH).'english', true);