chore: run Polish import on PR

Author: cagnulein

.github/workflows/import-polish-translation.yml

@@ -1,16 +1,20 @@
 name: Import Polish translation
 
 on:
-  push:
+  pull_request:
     branches:
-      - agent/update-polish-translation
+      - master
+    types:
+      - opened
+      - synchronize
   workflow_dispatch:
 
 permissions:
   contents: write
 
 jobs:
   import:
+    if: github.head_ref == 'agent/update-polish-translation'
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4