Fixes some portal closing bugs, a NullPointerException and a typo

Fixes a typo in nn-no
Fixes a bug causing always-on portals not to be closed properly
Fixes a possible NullPointerException in onEntityPortalEnter
Waits for block change request on reload which makes it possible to change the open-material with just a reload

src/main/java/net/knarcraft/stargate/portal/PortalOpener.java

@@ -146,7 +146,7 @@ public class PortalOpener {
      */
     public void closePortal(boolean force) {
         //No need to close a portal which is already closed
-        if (!isOpen) {
+        if (!isOpen()) {
             return;
         }