SEO - make sure module and controller name are in lowercase

For module controller, make sure that the name of the controller and the module are saved in lowercase. Otherwise the route will not be found in getModuleLink.

classes/Meta.php

@@ -85,11 +85,11 @@ class MetaCore extends ObjectModel
 		// Add modules controllers to list (this function is cool !)
 		foreach (glob(_PS_MODULE_DIR_.'*/controllers/front/*.php') as $file)
 		{
-			$filename = basename($file, '.php');
+			$filename = strtolower(basename($file, '.php'));
 			if ($filename == 'index')
 				continue;
 
-			$module = basename(dirname(dirname(dirname($file))));
+			$module = strtolower(basename(dirname(dirname(dirname($file)))));
 			$selected_pages[$module.' - '.$filename] = 'module-'.$module.'-'.$filename;
 		}