I've tried to translate the titles of "Start Workflow" and "Cancel" buttons in init workflow form but without success. Could someone explain what files to overwrite and how?
All you have to do is to change the message files. Have a look at the message files in this directory <strong>tomcat\webapps\share\WEB-INF\classes\alfresco\site-webscripts\org\alfresco\components\workflow</strong>.