Localization of those cosmetic changes:

 - The three strings $Lang{Backup_PC__Log_File__file},
    $Lang{Log_File__file__comment} and $Lang{Contents_of_log_file}
    are used for log files, config files and host files.  Therefore,
    the term "Log" is misleading.  I have removed "Log" from the
    value of these three strings:

        $Lang{Backup_PC__Log_File__file} = "BackupPC: File \$file";
        $Lang{Log_File__file__comment} = <<EOF;
        \${h1("File \$file \$comment")}
        <p>
        EOF
        $Lang{Contents_of_log_file} = <<EOF;
        Contents of file <tt>\$file</tt>, modified \$mtimeStr \$comment
        EOF

  - I have changed the value of $Lang{BackupPC__Server_Summary}
    to "BackupPC: Host Summary" instead of "BackupPC: Server Summary";

  - I have changed the value of $Lang{PC_Summary} to
    "Host Summary" instead of "PC Summary".

    These last two changes make the nav bar link, the page title
    and the page contents (the host summary) consistent.  Before
    the nav bar was "PC Summary", the page title was "Server Summary"
    and page contents were a summary of the hosts.