correct tooltip in LE-LLE plot

according to PPI family name mods for #55


Former-commit-id: c7fa1ebbd84978f161f528f2b400392fd7ddd152

ippisite/ippidb/templates/base.html

@@ -139,7 +139,7 @@
                             callbacks: {
                                 label: function(tooltipItem, data) {
                                     var dataItem = data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index];
-                                    return "compound " + dataItem.id + " on PPI " + dataItem.family_name;
+                                    return "compound " + dataItem.id + " on PPI family " + dataItem.family_name;
                                 }
                             }
                         }