Translations will depend on the activity of volunteers. We all have to collaborate if we trust this project.
Eu também sou usuário da língua portuguesa 
I used Portuguese (Brazil and Portugal), Galician and Spanish in LXDE, using the fallback feature. Now I see that LXQt has no native fallback support and I have asked Lubuntu Team to solve the problem.
You can benefit from the fallback too, from Brazilian Portuguese to Portuguese from Portugal, but it need to be fixed or implemented natively in Qt/LXQt.