inside of the comment icon is clickable in open layers

service/src/main/java/lcsb/mapviewer/services/overlay/IconManager.java

@@ -2,6 +2,8 @@ package lcsb.mapviewer.services.overlay;
 
 import org.apache.commons.lang3.mutable.MutableInt;
 
+import lcsb.mapviewer.common.Configuration;
+
 /**
  * This class return links to icons used by the client. It might be good idea to
  * move part of the functionality to client side as server shouldn't decide
@@ -137,6 +139,6 @@ public final class IconManager {
 	 * @return path to comment icon
 	 */
 	public String getCommentIcon() {
-		return "icons/comment.png";
+		return "icons/comment.png?v="+Configuration.getSystemBuildVersion(null);
 	}
 }