implement 'npm run lint:translations'

package.json

@@ -45,6 +45,7 @@
     "lint:js": "jshint --config .jshintrc --exclude-path .jshintignore .",
     "lint:server": "jshint --config .jshintrc lib",
     "lint:less": "./node_modules/lesshint/bin/lesshint -c ./.lesshintrc ./customize.dist/src/less2/",
+    "lint:translations": "node ./scripts/unused-translations.js",
     "test": "node scripts/TestSelenium.js",
     "test-rpc": "cd scripts/tests && node test-rpc",
     "template": "cd customize.dist/src && for page in ../index.html ../privacy.html ../terms.html ../contact.html ../what-is-cryptpad.html ../features.html ../../www/login/index.html ../../www/register/index.html ../../www/user/index.html;do echo $page; cp template.html $page; done;",