fix(deps): update dependency scratch-l10n to v4

Author: renovate[bot]

package-lock.json

@@ -86,7 +86,7 @@
     "redux-throttle": "^0.1.1",
     "scratch-audio": "^1.0.0",
     "scratch-blocks": "^1.1.6",
-    "scratch-l10n": "^3.18.3",
+    "scratch-l10n": "^4.0.0",
     "scratch-paint": "^2.2.151",
     "scratch-render": "^1.0.233",
     "scratch-render-fonts": "^1.0.2",