Add translation workflow file

Just to make sure we continuously test that the tools work. This won't
actually update any translations.

.github/workflows/translate.yml

@@ -0,0 +1,15 @@
+name: Translate
+
+on: [push, pull_request]
+
+jobs:
+  translate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+      - run: npm install
+      - run: sudo apt-get install gettext
+      - run: make -C po update-pot
+      - run: make -C po update-po
+      - run: make -C po update-js