Force dark text in header in dark mode

Force dark text in header in dark mode, see images (before and after my proposed change):

The light text is caused by Bootstrap (https://kde.org/scss/bootstrap.min.494a996021fafaf637fff44dbdaa602c8d8ab09c3ae776ec40edeaa76b41d1f5.css):

.tux-editor-request-right,.statstable>*>tr>td[data-sort-value="0.00000"]:nth-child(6),h1,.h1,h2,.h2,h3,.h3,h4,.h4,h5,.h5,h6,.h6,#kLegal,.lqt-thread-toolbar-timestamp,.lqt-thread-actions-icon,.page-info,.tux-breadcrumb,.tux-message-selector li a{color:#bdc3c7!important}