Replace global $lang with system.language

config/defaults.ini.php

@@ -209,7 +209,7 @@ invitation_only = false
 jpeg_quality = 100
 
 ; language (String)
-; Admin-created user default language.
+; System default languague, inluding admin-created user default language.
 ; Two-letters ISO 639-1 code.
 language = en
 

mod/help.php

@@ -6,13 +6,13 @@
 use Friendica\App;
 use Friendica\Content\Nav;
 use Friendica\Content\Text\Markdown;
+use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\System;
 
 function load_doc_file($s)
 {
-	global $lang;
+	$lang = Config::get('system', 'language');
-	if (!isset($lang)) $lang = 'en';
 	$b = basename($s);
 	$d = dirname($s);
 	if (file_exists("$d/$lang/$b")) {
@@ -30,8 +30,6 @@ function help_content(App $a)
 {
 	Nav::setSelected('help');
 
-	global $lang;
-
 	$text = '';
 
 	if ($a->argc > 1) {

mod/register.php

@@ -21,8 +21,6 @@ function register_post(App $a)
 {
 	check_form_security_token_redirectOnErr('/register', 'register');
 
-	global $lang;
-
 	$verified = 0;
 	$blocked  = 1;
 
@@ -123,7 +121,7 @@ function register_post(App $a)
 			dbesc(DateTimeFormat::utcNow()),
 			intval($user['uid']),
 			dbesc($result['password']),
-			dbesc($lang),
+			dbesc(Config::get('system', 'language')),
 			dbesc($_POST['permonlybox'])
 		);
 

mod/regmod.php

@@ -97,8 +97,6 @@ function user_deny($hash)
 
 function regmod_content(App $a)
 {
-	global $lang;
-
 	if (!local_user()) {
 		info(L10n::t('Please login.') . EOL);
 		$o = '<br /><br />' . Login::form($a->query_string, Config::get('config', 'register_policy') === REGISTER_CLOSED ? 0 : 1);

src/Content/Text/HTML.php

@@ -549,8 +549,6 @@ class HTML
 
 	public static function toPlaintext($html, $wraplength = 75, $compact = false)
 	{
-		global $lang;
-
 		$message = str_replace("\r", "", $html);
 
 		$doc = new DOMDocument();

src/Core/L10n.php

@@ -14,7 +14,7 @@ require_once 'include/dba.php';
  * Provide Languange, Translation, and Localisation functions to the application
  * Localisation can be referred to by the numeronym L10N (as in: "L", followed by ten more letters, and then "N").
  */
-class L10n
+class L10n extends \Friendica\BaseObject
 {
 	/**
 	 * @brief get the prefered language from the HTTP_ACCEPT_LANGUAGE header
@@ -62,11 +62,11 @@ class L10n
 	 */
 	public static function pushLang($language)
 	{
-		global $lang, $a;
+		$a = self::getApp();
 
-		$a->langsave = $lang;
+		$a->langsave = Config::get('system', 'language');
 
-		if ($language === $lang) {
+		if ($language === $a->langsave) {
 			return;
 		}
 
@@ -75,7 +75,7 @@ class L10n
 		}
 		$a->strings = [];
 		self::loadTranslationTable($language);
-		$lang = $language;
+		Config::set('system', 'language', $language);
 	}
 
 	/**
@@ -83,9 +83,9 @@ class L10n
 	 */
 	public static function popLang()
 	{
-		global $lang, $a;
+		$a = self::getApp();
 
-		if ($lang === $a->langsave) {
+		if (Config::get('system', 'language') === $a->langsave) {
 			return;
 		}
 
@@ -95,7 +95,7 @@ class L10n
 			$a->strings = [];
 		}
 
-		$lang = $a->langsave;
+		Config::set('system', 'language', $a->langsave);
 	}
 
 	/**
@@ -107,7 +107,7 @@ class L10n
 	 */
 	public static function loadTranslationTable($lang)
 	{
-		$a = get_app();
+		$a = self::getApp();
 
 		$a->strings = [];
 		// load enabled addons strings
@@ -142,7 +142,7 @@ class L10n
 	 */
 	public static function t($s, ...$vars)
 	{
-		$a = get_app();
+		$a = self::getApp();
 
 		if (empty($s)) {
 			return '';
@@ -173,7 +173,6 @@ class L10n
 	 * - L10n::tt('Like', 'Likes', $count)
 	 * - L10n::tt("%s user deleted", "%s users deleted", count($users))
 	 *
-	 * @global type $lang
 	 * @param string $singular
 	 * @param string $plural
 	 * @param int $count
@@ -181,10 +180,9 @@ class L10n
 	 */
 	public static function tt($singular, $plural, $count)
 	{
-		global $lang;
+		$lang = Config::get('system', 'language');
-		$a = get_app();
 
-		if (x($a->strings, $singular)) {
+		if (!empty($a->strings[$singular])) {
 			$t = $a->strings[$singular];
 			if (is_array($t)) {
 				$plural_function = 'string_plural_select_' . str_replace('-', '_', $lang);