Update to use Bootstrap 3 instead of Bootstrap 4. Fixes #3562

web/package.json

@@ -33,6 +33,7 @@
     "karma-webpack": "~2.0.13",
     "node-sass": "^4.5.3",
     "optimize-css-assets-webpack-plugin": "^2.0.0",
+    "popper.js": "^1.14.4",
     "raw-loader": "^0.5.1",
     "sass-loader": "^7.1.0",
     "sass-resources-loader": "^1.3.3",
@@ -56,7 +57,7 @@
     "backgrid-select-all": "^0.3.5",
     "backgrid-sizeable-columns": "^0.1.1",
     "bignumber.js": "^6.0.0",
-    "bootstrap": "^3.3.7",
+    "bootstrap": "^4.1.3",
     "bootstrap-datepicker": "^1.7.0",
     "bootstrap-switch": "3.3.4",
     "bowser": "1.6.1",