add version and translate all pages

backend/models/users.go

@@ -4,8 +4,8 @@ type User struct {
 	Username string
 }
 
-func NewUser(username string) (error, *User) {
-	return nil, &User{
+func NewUser(username string) (*User, error) {
+	return &User{
 		Username: username,
-	}
+	}, nil
 }