build: replace deprecated babel-preset-es2015 by babel-preset-env

./mvnw -Pfrontend frontend:npm -Dfrontend.npm.arguments='uninstall babel-preset-es2015 --save-dev'
./mvnw -Pfrontend frontend:npm -Dfrontend.npm.arguments='install babel-preset-env --save-dev'

Details: https://babeljs.io/docs/en/env/

Fix #1063

Author: php-coder

src/main/frontend/package-lock.json

@@ -6,7 +6,7 @@
   "dependencies": {},
   "devDependencies": {
     "babel-cli": "^6.26.0",
-    "babel-preset-es2015": "^6.24.1",
+    "babel-preset-env": "^1.7.0",
     "babel-preset-react": "^6.24.1"
   },
   "scripts": {
@@ -34,7 +34,7 @@
   "babel": {
     "presets": [
       "react",
-      "es2015"
+      "env"
     ]
   }
 }