To change the paths to the user folders (Music, Documents, Videos, etc).Open user-dirs.dirs file in terminal by command: 
 nano ~/.config/user-dirs.dirs
Each row is a user folder definition (music, video...), edit as you want 

# This file is written by xdg-user-dirs-update
# If you want to change or add directories, just edit the line you're
# interested in. All local changes will be retained on the next run
# Format is XDG_xxx_DIR="$HOME/yyy", where yyy is a shell-escaped
# homedir-relative path, or XDG_xxx_DIR="/yyy", where /yyy is an
# absolute path. No other format is supported.
#
XDG_DESKTOP_DIR="$HOME/Desktop"
XDG_DOWNLOAD_DIR="$HOME/ダウンロード"
XDG_TEMPLATES_DIR="$HOME/テンプレート"
XDG_PUBLICSHARE_DIR="$HOME/公開"
XDG_DOCUMENTS_DIR="$HOME/Documents"
XDG_MUSIC_DIR="$HOME/ミュージック"
XDG_PICTURES_DIR="$HOME/ピクチャ"
XDG_VIDEOS_DIR="$HOME/ビデオ"
Save file, Logout and Login back to effect properly.