CI: Check for missing translations.

.github/workflows/check-translations.yml

@@ -0,0 +1,24 @@
+name: Check translations
+
+on:
+  pull_request:
+    paths:
+      - "l10n/**"
+  push:
+    paths:
+      - "l10n/**"
+  schedule:
+    - cron: "0 2 * * SUN"
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2.4.0
+
+    - name: Install dependencies
+      run: sudo apt -y update && sudo apt -y install gettext
+
+    - name: Check translations
+      run: make check-translations

Makefile

@@ -31,6 +31,16 @@ translationfiles/%/pdfdraw.po: translationtool.phar pot
 l10n: translationtool.phar
 	./translationtool.phar convert-po-files
 
+check-translations: l10n
+	@out=$$(git diff l10n); \
+	if [ ! -z "$$out" ]; then \
+		echo; \
+		echo "Found unprocessed translations, need to update folder \"l10n\":"; \
+		echo; \
+		echo "$$out"; \
+		exit 1; \
+	fi
+
 npm: package.json package-lock.json
 	npm install