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/Template/SmartyExtend.php

@@ -160,13 +160,11 @@ class SmartyExtend extends \Smarty
 	 * also registers the getvar caller plugin
 	 *
 	 * @param \CoreLibs\Language\L10n $l10n l10n language class
-	 * @param array<string,string>    $locale locale data read from setLocale
 	 * @param string|null             $cache_id
 	 * @param string|null             $compile_id
 	 */
 	public function __construct(
 		\CoreLibs\Language\L10n $l10n,
-		array $locale,
 		?string $cache_id = null,
 		?string $compile_id = null
 	) {
@@ -192,13 +190,12 @@ class SmartyExtend extends \Smarty
 		// iinit lang
 		$this->l10n = $l10n;
 		// parse and read, legacy stuff
+		$locale = $this->l10n->getLocaleAsArray();
 		$this->encoding = $locale['encoding'];
 		$this->lang = $locale['lang'];
-		// get first part from lang
-		$this->lang_short = explode('_', $locale['lang'])[0];
-		$this->domain = $this->l10n->getDomain();
-		$this->locale_set = $this->l10n->getLocaleSet();
-		$this->lang_dir = $this->l10n->getBaseLocalePath();
+		$this->lang_short = $locale['lang_short'];
+		$this->domain = $locale['domain'];
+		$this->lang_dir = $locale['path'];
 
 		// opt load functions so we can use legacy init for smarty run perhaps
 		\CoreLibs\Language\L10n::loadFunctions();