only run on master

.github/workflows/update_locales.yml

@@ -4,6 +4,8 @@ on:
   push:
     paths:
       - '**.xml'
+    branches:
+      - master
 
 concurrency: 
   group: "locale-list"
@@ -24,4 +26,4 @@ jobs:
         git add .
         # "echo" returns true so the build succeeds, even if no changed files
         git commit -m 'chore: update list of locales' || echo
-        git push
+        git push