After installation of language pack Home, My Files, Shared Files, Sites and Tasks of share header menu is still in English. People and Repository translates properly into web browser language. Other parts of user interface are translated to.
I take alfresco_xx.jar and share_xx.jar files from translation.alfresco.com and put it to $TOMCAT_DIR/webapps/alfresco/WEB-INF/lib/ and $TOMCAT_DIR/webapps/share/WEB-INF/lib/ into appropriate docker container. This path described in Language Packs article. Jar files placed into tomcat/shared/lib don't works.