To translate theme labels such as: ‘Sort Portfolio’ and ‘All’ in the Portfolio filter, or parts of the Contact Page template, you will need to modify the theme language files. You can perform these changes by using the Loco Translate plugin or Poedit standalone software. This technique can be utilized not only if you are running your site in a language other than English, but also if you would simply like to change some theme labels. In other words - if you just want to change some existing label into a different string, eg. to change read more into continue reading.