Update image source to relative path

plwordnet/plwordnet.js

@@ -185,7 +185,7 @@ PlWordnet.prototype.createAdditionalInfo = function(jsonData, title, titleEn, la
         '<a href="/synsetid/plwordnet/' + element2.synset + '">' +
         '<p class="title">' + element2.lemma + '</p>' +
         '</a>' +
-        '<img width="40" height="20" class="img-responsive show-icon" src="http://lexp-dev.clarin-pl.eu/img/lang-' + lang + '-32.png" alt="Language" />' +
+        `<img width="40" height="20" class="img-responsive show-icon" src="/img/lang-${lang}-32.png" alt="Language" />` +
         definition +
         horizontalLine;
     });