1-1 Go to http://download.dokuwiki.org/
1-2 Check: Download changed files only
1-3 Toggle Languages and Select fa.
1-4 find download link and put it in right place.
2-1 Unpack and overwrite:
tar -xzvf dokuwiki-YYYY-MM-DD.tgz --strip-components=1
2-2 Remove unused files:
grep -Ev '^($|#)' data/deleted.files | xargs -n 1 rm -vf