The PortableApps Platform is multilanguage, but the folders "Documents", "Pictures", "Music" and "Videos" always stay in English, but is possible to add multilanguage support in folders, simple modify the "Desktop.ini" and the folders will be changed to OS language (Only Windows -- all versions):
Documents
[.ShellClassInfo]
LocalizedResourceName=@%SystemRoot%\system32\shell32.dll,-21770
InfoTip=@%SystemRoot%\system32\shell32.dll,-22914
IconFile=..\PortableApps\PortableApps.com\App\DefaultData\FolderIcons\documents.ico
IconIndex=0
Pictures
[.ShellClassInfo]
LocalizedResourceName=@%SystemRoot%\system32\shell32.dll,-21779
InfoTip=@%SystemRoot%\system32\shell32.dll,-12688
IconFile=..\..\PortableApps\PortableApps.com\App\DefaultData\FolderIcons\pictures.ico
IconIndex=0
Music
[.ShellClassInfo]
LocalizedResourceName=@%SystemRoot%\system32\shell32.dll,-21790
InfoTip=@%SystemRoot%\system32\shell32.dll,-12689
IconFile=..\..\PortableApps\PortableApps.com\App\DefaultData\FolderIcons\music.ico
IconIndex=0
Videos
[.ShellClassInfo]
LocalizedResourceName=@%SystemRoot%\system32\shell32.dll,-21791
InfoTip=@%SystemRoot%\system32\shell32.dll,-12690
IconFile=..\..\PortableApps\PortableApps.com\App\DefaultData\FolderIcons\videos.ico
IconIndex=0
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Sorry for this English, I'm Brazilian