add pax tooltip

src/app/i18n/en.json

@@ -116,6 +116,7 @@
     "pas": "Planetary Approach Suite",
     "pc": "Prospector Limpet Controller",
     "pce": "Economy Class Passenger Cabin",
+    "passenger capacity": "Passenger Capacity",
     "pci": "Business Class Passenger Cabin",
     "pcm": "First Class Passenger Cabin",
     "pcq": "Luxury Passenger Cabin",

src/app/pages/ShipyardPage.jsx

@@ -451,10 +451,10 @@ export default class ShipyardPage extends Page {
                   <th className="sortable" onClick={sortShips('maxCargo')}>
                     {translate('cargo')}
                   </th>
-                  <th className="sortable" onClick={sortShips('maxPassengers')}>
+                  <th className="sortable" onClick={sortShips('maxPassengers')} onMouseEnter={termtip.bind(null, 'passenger capacity')}
+                    onMouseLeave={hide}>
                     {translate('pax')}
                   </th>
-
                   <th className="lft" colSpan={7}>
                     {translate('core module classes')}
                   </th>