fix

src/server/routes/installer.js

@@ -92,12 +92,12 @@ module.exports = function(crowi, app) {
     // login with passport
     req.logIn(adminUser, (err) => {
       if (err) {
-        req.flash('successMessage', t('message.complete_to_install1'));
+        req.flash('successMessage', req.t('message.complete_to_install1'));
         req.session.redirectTo = '/admin/app';
         return res.redirect('/login');
       }
 
-      req.flash('successMessage', t('message.complete_to_install2'));
+      req.flash('successMessage', req.t('message.complete_to_install2'));
       return res.redirect('/admin/app');
     });
   };