Found a working solution for overlay status bar, so re-enabled it :)

config.xml

@@ -64,6 +64,7 @@
     </platform>
     <platform name="ios">
         <preference name="BackupWebStorage" value="local" />
+        <preference name="StatusBarOverlaysWebView" value="true" />
         <icon height="20" src="resources/ios/icon/Icon-App-20x20@1x.png" width="20" />
         <icon height="40" src="resources/ios/icon/Icon-App-20x20@2x.png" width="40" />
         <icon height="60" src="resources/ios/icon/Icon-App-20x20@3x.png" width="60" />

scss/ionic.app.scss

@@ -422,6 +422,14 @@ $screen-menu:                     845px;
 /**********
    Fix or extend generic CSS
 **********/
+html, body {
+  position: absolute;
+  top: 0;
+  left: 0;
+  height: 100%;
+  width: 100%;
+}
+
 .item.item-icon-right.item-select,
 .item.item-icon-right .item-select {
   select {
@@ -1866,7 +1874,7 @@ $ionicon-var-badge-editable: $ionicon-var-edit + "\00a0";
       padding-right: 0px !important;
 
       .platform-ios.platform-cordova & {
-        height: calc(env(safe-area-inset-top) + 160px);
+        height: calc(env(safe-area-inset-top) + 180px);
       }
 
       .hero {
@@ -1887,7 +1895,7 @@ $ionicon-var-badge-editable: $ionicon-var-edit + "\00a0";
       top: 150px;
 
       .platform-ios.platform-cordova & {
-        top: calc(env(safe-area-inset-top) + 160px);
+        top: calc(env(safe-area-inset-top) + 180px);
       }
     }
   }

www/js/app.js

@@ -138,5 +138,16 @@ angular.module('cesium', ['ionic', 'ionic-material', 'ngMessages', 'pascalprecht
     // Start plugins eager services
     PluginService.start();
 
+    ionicReady().then(function() {
+      if (ionic.Platform.isIOS()) {
+        if(window.StatusBar) {
+          // needed to fix Xcode 9 / iOS 11 issue with blank space at bottom of webview
+          // https://github.com/meteor/meteor/issues/9041
+          StatusBar.overlaysWebView(false);
+          StatusBar.overlaysWebView(true);
+        }
+      }
+    });
+
   })
 ;

www/js/config.js

@@ -94,7 +94,7 @@ angular.module("cesium.config", [])
 		}
 	},
 	"version": "1.4.6",
-	"build": "2019-09-06T23:58:55.971Z",
+	"build": "2019-09-07T12:44:11.195Z",
 	"newIssueUrl": "https://git.duniter.org/clients/cesium-grp/cesium/issues/new"
 })