Add setHardwareModeTooltip(), fix webmanifest src attr

app/js/custom.js

@@ -183,6 +183,7 @@ function contentLoaded() {
             break;
         case "hostapd_conf":
             loadChannel();
+            setHardwareModeTooltip();
             break;
         case "dhcpd_conf":
             loadInterfaceDHCPSelect();
@@ -387,6 +388,17 @@ function loadChannelSelect(selected) {
     });
 }
 
+/* Sets hardware mode tooltip text for selected interface.
+ * Messages are sent from ajax request for gettext locale support.
+ */
+function setHardwareModeTooltip() {
+    var iface = $('#cbxinterface').val();
+    $.post('ajax/networking/get_frequencies.php?',{'interface': iface},function(data){
+        responseText = JSON.parse(data);
+        $('#tiphwmode').attr('data-original-title', responseText);
+    });
+}
+
 /* Updates the selected blocklist
  * Request is passed to an ajax handler to download the associated list.
  * Interface elements are updated to indicate current progress, status.