Reply To: Add Text To/Before Breadcrumbs

Here is a function to show the You Are Here: text.

function rkk_breadcrumb_text() {
    $args['before']  = '<div class="bbp-breadcrumb"><p><span class="bbp-breadcrumb-text">You Are Here: </span>';
    return $args;
}
add_filter('bbp_before_get_breadcrumb_parse_args', 'rkk_breadcrumb_text');

You may have to edit this function later if bbPress shows their breadcrumb items in a list though.