/* Скрываем оригинальный текст */
.tmst-breadcrumbs__item_current {
    visibility: hidden !important;
    position: relative !important;
    min-width: 100px !important;
}

/* Показываем новый */
.tmst-breadcrumbs__item_current:before {
    content: "Мои курсы" !important;
    visibility: visible !important;
    position: absolute !important;
    left: 0 !important;
    top: 0 !important;
    width: 100% !important;
    height: 100% !important;
    display: flex !important;
    align-items: center !important;
    color: inherit !important;
    font-size: inherit !important;
    font-family: inherit !important;
}