I would give you two options
1 - through Liquid.. you can verify the language.. and then make a condition to display the correct label
{% assign language_code = website.selected_language.code | downcase %}
2 - content snippets.. (I would recommend this one)
create 2 snippets for each header (one for each language).. in your web template.. all you need to do is call the snippet.. the portal will handle the language in the background
in your liquid/html element for the header
<a class="header-title">{{ snippets["HEADER COLUMN NAME"] }}</a>