Deprecate the GetLocale class and replace with ACL\Login locales set

If ACL\Login is used, the loginGetLocale() call should be used to fetch
the locale data set during login

Language\L10n now has new encoding/charset optional parameter 4
If the locale does not have a charset set the defautl charset is UTF-8
unless set via the new parameter or setOverrideEncoding()

Because of the deprecation of the getLocales call the following methods
do no longer need $locales
- Admin\Backend
- Admin\EditBase
- Output\Form\Generate
- Template\SmartyExtend

They all use the new l10n->getLocaleAsArray() call to set all the local
variables

* Admin\EditBase has new parameter "options" to set
- cache_id
- compile_id
which must be passed on the SmartyExtend class init

www/lib/CoreLibs/Admin/Backend.php

@@ -121,14 +121,13 @@ class Backend
 	 * @param \CoreLibs\Debug\Logging  $log     Logging class
 	 * @param \CoreLibs\Create\Session $session Session interface class
 	 * @param \CoreLibs\Language\L10n  $l10n    l10n language class
-	 * @param array<string,string>     $locale  locale data read from setLocale
+	 * @param int|null                 $set_default_acl_level Default ACL level
 	 */
 	public function __construct(
 		\CoreLibs\DB\IO $db,
 		\CoreLibs\Debug\Logging $log,
 		\CoreLibs\Create\Session $session,
 		\CoreLibs\Language\L10n $l10n,
-		array $locale,
 		?int $set_default_acl_level = null
 	) {
 		// attach db class
@@ -142,12 +141,12 @@ class Backend
 		// get the language sub class & init it
 		$this->l = $l10n;
 		// parse and read, legacy stuff
+		$locale = $this->l->getLocaleAsArray();
 		$this->encoding = $locale['encoding'];
 		$this->lang = $locale['lang'];
-		// get first part from lang
-		$this->lang_short = explode('_', $locale['lang'])[0];
-		$this->domain = $this->l->getDomain();
-		$this->lang_dir = $this->l->getBaseLocalePath();
+		$this->lang_short = $locale['lang_short'];
+		$this->domain = $locale['domain'];
+		$this->lang_dir = $locale['path'];
 
 		// set the page name
 		$this->page_name = \CoreLibs\Get\System::getPageName();