Translation JSONs are now generated at build time, removing the necessity to manually run xliff-to-json

- added postbuild.mjs to facilitate this
- all ng build --prod's have been replaced with npm run build

package.json

@@ -5,7 +5,8 @@
   "scripts": {
     "ng": "ng",
     "start": "ng serve",
-    "build": "ng build",
+    "build": "ng build --prod",
+    "prebuild": "node src/postbuild.mjs",
     "heroku-postbuild": "npm install --prefix backend",
     "test": "ng test",
     "lint": "ng lint",
@@ -37,6 +38,7 @@
     "file-saver": "^2.0.2",
     "filesize": "^6.1.0",
     "fingerprintjs2": "^2.1.0",
+    "fs-extra": "^10.0.0",
     "material-icons": "^0.5.4",
     "nan": "^2.14.1",
     "ng-lazyload-image": "^7.0.1",
@@ -47,6 +49,7 @@
     "tslib": "^2.0.0",
     "typescript": "~4.0.5",
     "web-animations-js": "^2.3.2",
+    "xliff-to-json": "^1.0.4",
     "zone.js": "~0.10.2"
   },
   "devDependencies": {