Move i18n utils to its own module

Author: germain-gg

package.json

@@ -23,19 +23,17 @@
     "package.json"
   ],
   "bin": {
-    "reskindex": "scripts/reskindex.js",
-    "matrix-gen-i18n": "scripts/gen-i18n.js",
-    "matrix-prune-i18n": "scripts/prune-i18n.js"
+    "reskindex": "scripts/reskindex.js"
   },
   "main": "./src/index.js",
   "matrix_src_main": "./src/index.js",
   "matrix_lib_main": "./lib/index.js",
   "matrix_lib_typings": "./lib/index.d.ts",
   "scripts": {
     "prepublishOnly": "yarn build",
-    "i18n": "matrix-gen-i18n",
-    "prunei18n": "matrix-prune-i18n",
-    "diff-i18n": "cp src/i18n/strings/en_EN.json src/i18n/strings/en_EN_orig.json && ./scripts/gen-i18n.js && node scripts/compare-file.js src/i18n/strings/en_EN_orig.json src/i18n/strings/en_EN.json",
+    "i18n": "gen-i18n",
+    "prunei18n": "prune-i18n",
+    "diff-i18n": "cp src/i18n/strings/en_EN.json src/i18n/strings/en_EN_orig.json && gen-i18n && compare-i18n-files src/i18n/strings/en_EN_orig.json src/i18n/strings/en_EN.json",
     "reskindex": "node scripts/reskindex.js -h header",
     "reskindex:watch": "node scripts/reskindex.js -h header -w",
     "rethemendex": "res/css/rethemendex.sh",
@@ -160,6 +158,7 @@
     "jest-fetch-mock": "^3.0.3",
     "matrix-mock-request": "^1.2.3",
     "matrix-react-test-utils": "^0.2.2",
+    "matrix-web-i18n": "github:matrix-org/matrix-web-i18n",
     "olm": "https://packages.matrix.org/npm/olm/olm-3.2.1.tgz",
     "react-test-renderer": "^16.14.0",
     "rimraf": "^3.0.2",