diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index d35a3606928..7341adee8ba 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -2,6 +2,11 @@ name: Core
 
 on:
   pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - labeled
   workflow_dispatch:
   schedule:
     - cron: '15 23 * * *'  # every day @ 23:15
@@ -20,6 +25,16 @@ env:
     |All            |[main](https://data.trezor.io/dev/firmware/master_diff/${{ github.run_id }}/index.html)([screens](https://data.trezor.io/dev/firmware/master_diff/${{ github.run_id }}/master_diff.html)) ||
 
 jobs:
+  param:
+    name: Determine pipeline parameters
+    runs-on: ubuntu-latest
+    outputs:
+      test_lang: ${{ steps.set_lang.outputs.test_lang }}
+    steps:
+      - id: set_lang
+        run: |
+          echo test_lang=${{ github.event_name == 'pull_request' && github.event.action == 'labeled' && github.event.label.name == 'tests' && '["en", "cs", "fr", "de", "es"]' || '["en"]' }} >> $GITHUB_OUTPUT
+
   core_firmware:
     name: Build firmware
     runs-on: ubuntu-latest
@@ -183,7 +198,9 @@ jobs:
   core_device_test:
     name: Device tests
     runs-on: ubuntu-latest
-    needs: core_emu
+    needs:
+      - core_emu
+      - param
     strategy:
       fail-fast: false
       matrix:
@@ -191,7 +208,7 @@ jobs:
         coins: [universal, btconly]
         asan: ${{ fromJSON(github.event_name == 'schedule' && '["noasan", "asan"]' || '["noasan"]') }}
         # lang: ${{ fromJSON(github.event_name == 'schedule' && '["en", "cs", "fr", "de", "es"]' || '["en"]') }}
-        lang: [en, cs, fr, de, es]
+        lang: ${{ fromJSON(needs.param.outputs.test_lang) }}
         # T2B1 fails due to https://github.com/trezor/trezor-firmware/issues/3280
         # remove after single global layout is implemented (or bug above fixed):
         exclude: