In English, what gets displayed in the browser’s tab is “Latest topics - Site Name”. The site name will be set to the value of your title site setting. You can find the translation strings that are used to set the words for “Latest” and “topics” by enabling verbose localization for your session. This guide explains how to do that: Find a translation key with verbose localization.
I’m wondering if the issue you are finding is a RTL display issue. Is the - symbol being displayed in the wrong place in the string? It should be displayed between the words for “Latest topics” and you site’s name.