Override template notices

bp-custom.php

<?php

function slaffik_render_message() {
	// Get BuddyPress
	$bp = buddypress();

	if ( ! empty( $bp->template_message ) ) :
		$type    = ( 'success' === $bp->template_message_type ) ? 'updated' : 'error';
		$content = apply_filters( 'bp_core_render_message_content', $bp->template_message, $type ); ?>

		<div id="message" class="slaffik-notice <?php echo esc_attr( $type ); ?>">

			<?php echo $content; ?>

		</div>

	<?php

		do_action( 'bp_core_render_message' );

	endif;
}

function slaffik_remove_bp_core_render_message() {
	remove_action( 'template_notices', 'bp_core_render_message' );
	add_action( 'template_notices', 'slaffik_render_message' );
}
add_action( 'bp_actions', 'slaffik_remove_bp_core_render_message', 6 );