title: Polylang plugin for Wordpress does not have string translation menu
body: <p>I have installed a plugin on WordPress 4.9.2. I have only three plugin menu items Languages, Settings and Lingotek, String translation option is missing. I am trying to work with some custom theme, created by the developer.</p>
  
  <p>When I am selecting default language and applying it to posts, tags, etc – most part of my site is not displaying at all.</p>
  
  <p>How can I fix this issue&amp;</p>