Set your desktop environment's language to English. (I don't know whether you're using Manjaro plasma desktop, xfce desktop or gnome desktop. But all of these have a settings dialog where you can change the language.)
If you don't want to change the language: Rename the folders as you want them to be named. Afterwards, run
xdg-user-dirs-update --set NAME NEW_PATH
where _`NAME`_ is `DESKTOP`, `DOWNLOAD`, `TEMPLATES`, `PUBLICSHARE`, `DOCUMENTS`, `MUSIC`, `PICTURES` or `VIDEOS` (and describes the thing whose directory you want to change), and _`NEW_PATH`_ should be the new path – ideally, something like `'$HOME/Desktop'`, `'$HOME/Download'`, `'$HOME/Templates'`, ….
The file /etc/xdg/user-dirs.defaults should contain the default English folder names to be used after `$HOME/` on your Linux distro.