fix translation for core/lostpassword

lib/template.php

@@ -158,7 +158,8 @@ class OC_Template{
 		if($renderas == 'user') {
 			$this->vars['requesttoken'] = OC_Util::callRegister();
 		}
-		$this->l10n = OC_L10N::get($app);
+		$parts = explode('/', $app); // fix translation when app is something like core/lostpassword
+		$this->l10n = OC_L10N::get($parts[0]);
                 header('X-Frame-Options: Sameorigin');
                 header('X-XSS-Protection: 1; mode=block');
                 header('X-Content-Type-Options: nosniff');