diff --git a/4dev/tests/CoreLibsLanguageL10nTest.php b/4dev/tests/CoreLibsLanguageL10nTest.php
index fa85cce3..e6d53085 100644
--- a/4dev/tests/CoreLibsLanguageL10nTest.php
+++ b/4dev/tests/CoreLibsLanguageL10nTest.php
@@ -109,10 +109,11 @@ final class CoreLibsLanguageL10nTest extends TestCase
 			// 2: encoding
 			// 3: path
 			// 4: locale expected
-			// 5: domain exepcted
-			// 6: context (null for none)
-			// 7: test string in
-			// 8: test translated
+			// 5: locale set expected
+			// 6: domain exepcted
+			// 7: context (null for none)
+			// 8: test string in
+			// 9: test translated
 			// new style load
 			'gettext load en' => [
 				'en_US.UTF-8',
@@ -120,6 +121,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				__DIR__ . 'includes/locale/',
 				//
 				'en_US.UTF-8',
+				'en_US',
 				'frontend',
 				null,
 				'Original',
@@ -131,6 +133,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				__DIR__ . 'includes/locale/',
 				//
 				'en_US.UTF-8',
+				'en_US',
 				'frontend',
 				'context',
 				'Original',
@@ -142,6 +145,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				__DIR__ . 'includes/locale/',
 				//
 				'ja_JP.UTF-8',
+				'ja_JP',
 				'admin',
 				null,
 				'Original',
@@ -154,6 +158,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				'frontend',
 				//
 				'en_US.UTF-8',
+				'en_US',
 				'frontend',
 				'context',
 				'Original',
@@ -167,6 +172,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				//
 				'',
 				'',
+				'',
 				null,
 				'Original',
 				'Original',
@@ -185,6 +191,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 	 * @param  string|null $domain
 	 * @param  string|null $path
 	 * @param  string      $locale_expected
+	 * @param  string      $locale_set_expected
 	 * @param  string      $domain_expected
 	 * @param  ?string     $context
 	 * @param  string      $original
@@ -196,6 +203,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 		?string $domain,
 		?string $path,
 		string $locale_expected,
+		string $locale_set_expected,
 		string $domain_expected,
 		?string $context,
 		string $original,
@@ -217,6 +225,11 @@ final class CoreLibsLanguageL10nTest extends TestCase
 			$l10n->getLocale(),
 			'Locale assert failed'
 		);
+		$this->assertEquals(
+			$locale_set_expected,
+			$l10n->getLocaleSet(),
+			'Locale set assert failed'
+		);
 		$this->assertEquals(
 			$domain_expected,
 			$l10n->getDomain(),
@@ -255,15 +268,17 @@ final class CoreLibsLanguageL10nTest extends TestCase
 			// 3: load error
 			// 4: input string to translated
 			// 5: expected locale
-			// 6: expected domain
-			// 7: expected translation
-			// 8: change locale
-			// 9: change domain
-			// 10: change path
-			// 11: change load error
-			// 12: expected locale
-			// 13: expected domain
-			// 14: expected translation
+			// 6: expected locale set
+			// 7: expected domain
+			// 8: expected translation
+			// 9: change locale
+			// 10: change domain
+			// 11: change path
+			// 12: change load error
+			// 13: expected locale
+			// 14: expected locale set
+			// 15: expected domain
+			// 16: expected translation
 			'load and change (en->ja)' => [
 				// set 0-2
 				'en_US.UTF-8',
@@ -275,6 +290,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				'Original',
 				// check setter 5-7
 				'en_US.UTF-8',
+				'en_US',
 				'frontend',
 				'Translated frontend en_US',
 				// set new 8-10
@@ -285,6 +301,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				false,
 				// check new setter 12-14
 				'ja_JP.UTF-8',
+				'ja_JP',
 				'frontend',
 				'Translated frontend ja_JP',
 			],
@@ -300,6 +317,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				// check setter 5-7
 				'',
 				'',
+				'',
 				'Original',
 				// set new 8-10
 				'en_US.UTF-8',
@@ -309,6 +327,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 				false,
 				// check new setter 12-14
 				'en_US.UTF-8',
+				'en_US',
 				'frontend',
 				'Translated frontend en_US',
 			]
@@ -329,12 +348,14 @@ final class CoreLibsLanguageL10nTest extends TestCase
 	 * @param  bool        $load_error
 	 * @param  string      $original
 	 * @param  string      $locale_expected_a
+	 * @param  string      $locale_set_expected_a
 	 * @param  string      $domain_expected_a
 	 * @param  string      $translated_a
 	 * @param  string|null $locale_new
 	 * @param  string|null $domain_new
 	 * @param  string|null $path_new
 	 * @param  bool        $load_error_new
+	 * @param  string      $locale_set_expected_b
 	 * @param  string      $locale_expected_b
 	 * @param  string      $domain_expected_b
 	 * @param  string      $translated_b
@@ -351,6 +372,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 		string $original,
 		// 5-7
 		string $locale_expected_a,
+		string $locale_set_expected_a,
 		string $domain_expected_a,
 		string $translated_a,
 		// 8-10
@@ -361,6 +383,7 @@ final class CoreLibsLanguageL10nTest extends TestCase
 		bool $load_error_new,
 		// 12-14
 		string $locale_expected_b,
+		string $locale_set_expected_b,
 		string $domain_expected_b,
 		string $translated_b,
 	): void {
@@ -384,6 +407,10 @@ final class CoreLibsLanguageL10nTest extends TestCase
 			$locale_expected_a,
 			$l10n->getLocale(),
 			'Locale init assert failed'
+		);$this->assertEquals(
+			$locale_set_expected_a,
+			$l10n->getLocaleSet(),
+			'Locale Set init assert failed'
 		);
 		$this->assertEquals(
 			$domain_expected_a,
@@ -435,6 +462,11 @@ final class CoreLibsLanguageL10nTest extends TestCase
 			$l10n->getLocale(),
 			'Locale change assert failed'
 		);
+		$this->assertEquals(
+			$locale_set_expected_b,
+			$l10n->getLocaleSet(),
+			'Locale Set change assert failed'
+		);
 		$this->assertEquals(
 			$domain_expected_b,
 			$l10n->getDomain(),
diff --git a/www/lib/CoreLibs/Language/L10n.php b/www/lib/CoreLibs/Language/L10n.php
index 7303f0fc..fca07ce2 100644
--- a/www/lib/CoreLibs/Language/L10n.php
+++ b/www/lib/CoreLibs/Language/L10n.php
@@ -34,6 +34,8 @@ class L10n
 {
 	/** @var string the current locale */
 	private $locale = '';
+	/** @var string the SET locale as WHERE the domain file is */
+	private $locale_set = '';
 	/** @var string the default selected/active domain */
 	private $domain = '';
 	/** @var array<string,array<string,GetTextReader>> locale > domain = translator */
@@ -141,6 +143,7 @@ class L10n
 		// store old settings
 		$old_mofile = $this->mofile;
 		$old_lang = $this->locale;
+		$old_lang_set = $this->locale_set;
 		$old_domain = $this->domain;
 		$old_base_locale_path = $this->base_locale_path;
 		$old_base_content_path = $this->base_content_path;
@@ -172,6 +175,7 @@ class L10n
 				. $this->base_content_path
 				. $domain . '.mo';
 			if (file_exists($this->mofile)) {
+				$this->locale_set = $_locale;
 				break;
 			}
 		}
@@ -202,6 +206,7 @@ class L10n
 			// else fall back to the old ones
 			$this->mofile = $old_mofile;
 			$this->locale = $old_lang;
+			$this->locale_set = $old_lang_set;
 			$this->domain = $old_domain;
 			$this->base_locale_path = $old_base_locale_path;
 			$this->base_content_path = $old_base_content_path;
@@ -454,7 +459,7 @@ class L10n
 	}
 
 	/**
-	 * get current set locale
+	 * get current set locale (want locale)
 	 *
 	 * @return string
 	 */
@@ -463,6 +468,16 @@ class L10n
 		return $this->locale;
 	}
 
+	/**
+	 * current set locale where mo file is located
+	 *
+	 * @return string
+	 */
+	public function getLocaleSet(): string
+	{
+		return $this->locale_set;
+	}
+
 	/**
 	 * get current set language
 	 *
diff --git a/www/lib/CoreLibs/Template/SmartyExtend.php b/www/lib/CoreLibs/Template/SmartyExtend.php
index 475290e1..5edee4df 100644
--- a/www/lib/CoreLibs/Template/SmartyExtend.php
+++ b/www/lib/CoreLibs/Template/SmartyExtend.php
@@ -32,6 +32,8 @@ class SmartyExtend extends \Smarty
 	/** @var string */
 	public $lang;
 	/** @var string */
+	public $locale_set;
+	/** @var string */
 	public $lang_short;
 	/** @var string */
 	public $domain;
@@ -170,6 +172,7 @@ class SmartyExtend extends \Smarty
 		// 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();
 
 		// opt load functions so we can use legacy init for smarty run perhaps
@@ -312,7 +315,9 @@ class SmartyExtend extends \Smarty
 		}
 		// javascript translate data as template for auto translate
 		if (empty($this->TEMPLATE_TRANSLATE)) {
-			$this->TEMPLATE_TRANSLATE = 'jsTranslate_' . $this->lang . '.tpl';
+			$this->TEMPLATE_TRANSLATE = 'jsTranslate_'
+				. $this->locale_set . '.' . $this->encoding
+				. '.tpl';
 		} else {
 			// we assume we have some fixed set
 			// we must add _<$this->lang>
@@ -321,12 +326,12 @@ class SmartyExtend extends \Smarty
 			if (strpos($this->TEMPLATE_TRANSLATE, '.tpl')) {
 				$this->TEMPLATE_TRANSLATE = str_replace(
 					'.tpl',
-					'-' . $this->lang . '.' . $this->encoding . '.tpl',
+					'-' . $this->locale_set . '.' . $this->encoding . '.tpl',
 					$this->TEMPLATE_TRANSLATE
 				);
 			} else {
 				$this->TEMPLATE_TRANSLATE .= '_'
-					. $this->lang . '.' . $this->encoding
+					. $this->locale_set . '.' . $this->encoding
 					. '.tpl';
 			}
 		}