Suggestion:

Change this
<pre>
/**

• The default columns to be included in the View Issues Page.
• This can be overriden using Manage -> Manage Configuration -> Manage Columns
• Also each user can configure their own columns using My Account -> Manage
• Columns. Some of the columns specified here can be removed automatically if
• they conflict with other configuration. Or if the current user doesn't have
• the necessary access level to view them. For example, sponsorship_total will
• be removed if sponsorships are disabled. To include custom field 'xyz',
• include the column name as 'custom_xyz'.
• Standard Column Names (i.e. names to choose from):
• id, project_id, reporter_id, handler_id, duplicate_id, priority, severity,
• reproducibility, status, resolution, category_id, date_submitted, last_updated,
• os, os_build, platform, version, fixed_in_version, target_version, view_state,
• summary, sponsorship_total, due_date, description, steps_to_reproduce,
• additional_info, attachment_count, bugnotes_count, selection, edit,
• overdue
• @global array $g_view_issues_page_columns
  */
  </pre>

for
<pre>
/**

• The default columns to be included in the View Issues Page.
• This can be overriden using Manage -> Manage Configuration -> Manage Columns
• Also each user can configure their own columns using My Account -> Manage
• Columns. Some of the columns specified here can be removed automatically if
• they conflict with other configuration. Or if the current user doesn't have
• the necessary access level to view them. For example, sponsorship_total will
• be removed if sponsorships are disabled. To include custom field 'xyz',
• include the column name as 'custom_xyz'.
• Standard Column Names (i.e. names to choose from):
• id, project_id, reporter_id, handler_id, duplicate_id, priority, severity,
• reproducibility, status, resolution, category_id, date_submitted, last_updated,
• os, os_build, platform, version, fixed_in_version, target_version, view_state,
• summary, sponsorship_total, due_date, description, steps_to_reproduce,
• additional_info, attachment_count, bugnotes_count, selection, edit,
• overdue,eta
• @global array $g_view_issues_page_columns
  */
  </pre>