Error not displaying content text in the user login control

I have submitted an error report to support. But 3 months have not seen it fixed. So now I post it here.
When you visit the user login page. The texts are not displayed, all are blank cells with no text attached.

Inside the console everything is normal. I have installed a new CWP on a brand new 7 centos with the same situation. Even I have access to the demo of CWP itself. They also don't show text in the user login page.

Well, that's a small screenshot! 

Well, that's a small screenshot! 

Sorry! I not edit topic.
Screenshot new :

don't see that issue anywhere, maybe something related to your browser ?

don't see that issue anywhere, maybe something related to your browser ?

I don't know if the country region affects the display.  I come from Vietnam.  I have tried it on many different browsers and devices.  But all of them are not showing up.  Although I have tried the demo page provided by CWP itself.  Or you can press ctrl f5 to see if it updates the same as mine..

Hello
Can you please tell me which is the language of your browser? here may be your problem

Hello
Can you please tell me which is the language of your browser? here may be your problem

Yes. Exactly the error is due to the browser language is Vietnamese. If I change the language to English there is no error. I think a web UI cannot set the language according to the browser UI in case the language is not supported. For me personally, it doesn't matter. But most of my clients use Vietnamese. You can fix this?