diff --git a/lighthouse-core/scripts/roll-to-devtools.sh b/lighthouse-core/scripts/roll-to-devtools.sh
index e892db9a5858..89fb9cdcb6de 100755
--- a/lighthouse-core/scripts/roll-to-devtools.sh
+++ b/lighthouse-core/scripts/roll-to-devtools.sh
@@ -14,6 +14,7 @@
 #   yarn devtools node_modules/temp-devtoolsfrontend/front_end/
 
 chromium_dir="$HOME/chromium/src"
+check="\033[96m ✓\033[39m"
 
 if [[ -n "$1" ]]; then
   frontend_dir="$1"
@@ -29,26 +30,37 @@ if [[ ! -d "$frontend_dir" || ! -a "$frontend_dir/Runtime.js" ]]; then
   echo "    $frontend_dir"
   exit 1
 else
-  echo -e "\033[96m ✓\033[39m Chromium folder in place."
+  echo -e "$check Chromium folder in place."
 fi
 
-report_dir="lighthouse-core/report/html"
 fe_lh_dir="$frontend_dir/audits/lighthouse"
 
 lh_bg_js="dist/lighthouse-dt-bundle.js"
-lh_worker_dir="$frontend_dir/audits_worker/lighthouse"
+fe_worker_dir="$frontend_dir/audits_worker/lighthouse"
 
 # copy lighthouse-dt-bundle (potentially stale)
-cp -pPR "$lh_bg_js" "$lh_worker_dir/lighthouse-dt-bundle.js"
-echo -e "\033[96m ✓\033[39m (Potentially stale) lighthouse-dt-bundle copied."
+cp -pPR "$lh_bg_js" "$fe_worker_dir/lighthouse-dt-bundle.js"
+echo -e "$check (Potentially stale) lighthouse-dt-bundle copied."
 
 # copy report generator + cached resources into $fe_lh_dir
-# use dir/* format to copy over all files in dt-report-resources directly to $fe_lh_dir 
+# use dir/* format to copy over all files in dt-report-resources directly to $fe_lh_dir
 # dir/ format behavior changes based on if their exists a folder named dir, which can get weird
-cp -r dist/dt-report-resources/* $fe_lh_dir
+cp -r dist/dt-report-resources/* "$fe_lh_dir"
+echo -e "$check Report resources copied."
+
+# copy locale JSON files (but not the .ctc.json ones)
+lh_locales_dir="lighthouse-core/lib/i18n/locales"
+fe_locales_dir="$frontend_dir/audits_worker/lighthouse/locales"
+
+mkdir -p "$fe_locales_dir"
+find $lh_locales_dir -name '*.json' ! -name '*.ctc.json'  -exec cp {} "$fe_locales_dir" \;
+echo -e "$check Locale JSON files copied."
 
 # update expected version string in tests
 VERSION=$(node -e "console.log(require('./package.json').version)")
 sed -i '' -e "s/Version:.*/Version: $VERSION/g" "$tests_dir"/*-expected.txt
+echo -e "$check Updated Version string in tests."
 
-echo "Done. To rebase the test expectations, run: yarn --cwd ~/chromium/src/third_party/blink/renderer/devtools test 'http/tests/devtools/audits/*.js' --reset-results"
+echo ""
+echo "Done. To rebase the test expectations, run: "
+echo "    yarn --cwd ~/chromium/src/third_party/blink/renderer/devtools test 'http/tests/devtools/audits/*.js' --reset-results"