Remove any unnecessary fonts to reduce size of font files.

1. Pull lastest docker image of onlyoffice server. Then cope new fonts to docker container.

   docker pull onlyoffice/documentserver
   docker stop office
   docker rm office
   docker run -i -t -d -p 5580:80 --restart=always --name=office onlyoffice/documentserver
   docker cp onlyoffice-fonts office:/usr/share/fonts/truetype/custom
   docker ps
   docker exec -it office bash

2. Removing original fonts.

   rm -rf /var/www/onlyoffice/documentserver/core-fonts/*
   rm -rf /usr/share/fonts/X11
   rm -rf /usr/share/fonts/truetype/{* except custom path}

3. Generate new fonts cache.

   bash /usr/bin/documentserver-generate-allfonts.sh

If you want update help documents for Chinese, run

cp -r /var/www/onlyoffice/documentserver/web-apps/apps/documenteditor/main/resources/help/en \
/var/www/onlyoffice/documentserver/web-apps/apps/documenteditor/main/resources/help/zh