If you decide not to call it "File System"/"Filesystem" you may want to change it in the filebrowser (or file browser ;)) plugin in Gedit too (plugins/filebrowser/gedit-file-bookmarks-store.c, end of function init_special_directories).
If you decide not to call it "File System" /"Filesystem" you may want to change it in the filebrowser (or file browser ;)) plugin in Gedit too (plugins/ filebrowser/ gedit-file- bookmarks- store.c, end of function init_special_ directories) .