That is a theme specific question, but it seems to be easy enough.
The theme has a i18n directory for translations: gohugo-theme-ananke/i18n at master · theNewDynamic/gohugo-theme-ananke · GitHub
Add your translation in the appropriate file, and then change it in the layout of the theme to use that string. Here is an example: gohugo-theme-ananke/site-navigation.html at master · theNewDynamic/gohugo-theme-ananke · GitHub