I still didn't get it. Can someone write a short instruction?
So, we have in file /public/language/en-US/pages.json key "unread" with value "Unread Topics"
What should i do, so when user selects en-US language, she will see not "Unread Topics", but "Some other phrase" where 'pages.unread' placeholder is used?
Of course i do not want to change this string value directly in the language file, as it will be overwritten during future updates. But what should i do?