Previous, Next buttons use aria-label instead of content for name

[Tanvez]

Issue Description	WCAG Criteria	Status	Category	Example	Notes
Previous, Next buttons use aria-label instead of content for name.	QA	Identified	Screen reader, Voice Control	<button class="tl-slidenav-previous" type="button" aria-label="previous, Women in Computing, " style="top: 458px; display: block;">  <div class="tl-slidenav-content-container">   <div class="tl-slidenav-icon"> </div>    <div class="tl-slidenav-title">Women in Computing</div>    <div class="tl-slidenav-description"></div>  </div></button>	aria-label tends to not be translated. Removing aria-label and replacing &nbsp; with a visually-hidden span containing "Previous" or "Next" will result in the same button name.