Translate the old-extension message in ext.php (#8)

ext.php refused to enable with a hard-coded English message while the old extension was still enabled. The message now comes from the install language file, as phpBB's validation policy requires.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: bonelifer

ext.php

@@ -42,7 +42,10 @@ public function is_enableable()
 
 		if ($ext_manager->is_enabled(self::OLD_EXT_NAME))
 		{
-			return ['Disable the old "' . self::OLD_EXT_NAME . '" extension first.'];
+			$language = $this->container->get('language');
+			$language->add_lang('install_inserticonifyscript', 'phpbbmodders/inserticonifyscript');
+
+			return $language->lang('INSERTICONIFYSCRIPT_DISABLE_OLD', self::OLD_EXT_NAME);
 		}
 
 		return true;

language/en/install_inserticonifyscript.php

@@ -39,4 +39,5 @@
 
 $lang = array_merge($lang, [
 	'INSERTICONIFYSCRIPT_NOT_ENABLEABLE'	=> 'Insert Iconify Script could not be enabled. The minimum requirements of phpBB 3.3.19 and/or PHP 7.4.0 were not satisfied.',
+	'INSERTICONIFYSCRIPT_DISABLE_OLD'	=> 'Disable the old “%s” extension first.',
 ]);