UDOIT does not accept modern filetypes for classic counterparts [docx, pptx, xlsx]

[taheralfayad]

Upon using the review files tab in UDOIT, I found out that a file that has the .doc filetype can only accept .doc filetypes. Moreover, even files that are of type .docx can only accept .doc files. The same goes for pptx and xlsx files. This represents an issue for most people who nowadays use the .docx, .pptx, and .xlsx extensions. In addition to this bug, UDOIT returns a message that is vague and is not translated in the en.json file.