I use Windows 10 Home, brazilian portuguese (upgraded from win 7, pt-BR too). I know that Windows makes a translation of its main folders to match the display language and be user-friendly to those who don't have English as its native language. I noticed today that other folders are translated but "Program Files" still appearing in english, and in brazilian portuguese, that folder is named as "Arquivos de Programas".
If it matters to this question, some time in the past, I downloaded the US english pack and used it as my default display language, just to study english actually and to be in contact with windows english version and names, so when I had to search internet about an issue, I only found content if it searched in english. From some months to now, I enabled brazilian portuguese back and removed english language pack, to get more comfortable using it.
I found some topics on internet from people saying that the desktop.ini file could be missing or corrupted.
How to get "Program Files" properly translated again as it should happen by default? Have you ever seen that issue?
UPDATE: I opened the desktop.ini file inside Program Files folder and here is its content: