Yes You can change it.
go to this location : C:\Program Files\Atlassian\JIRA\atlassian-jira\WEB-INF\classes\com\atlassian\jira\web\action\JiraWebActionSupport.properties
Edit in that file.
issue.field.summary = Summary
issue.field.summary = Title
It work definitately
I would not recommend defaulting a summary, unless you really do want a vast swathe of your issues to all look indistinguishable most of the time. The summary is there, empty and mandatory, for a very good reason. In the handful of places where I've seen this done, it causes problems with users complaining that the information in issues is rubbish, and we always remove it.
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