Change Last Updated on Text

Hi,

You can change the text from here: http://prntscr.com/qxvjfx and

Apply these css to your website: http://prntscr.com/qxvly8

.post-last-modified,
.page-last-modified {
    font-weight: bold;
}

.post-last-modified-td,
.page-last-modified-td {
    font-weight: normal;
}

Thanks!