Add script for finding translated strings with broken placeholders

scripts/check-translation-strings.py

@@ -0,0 +1,22 @@
+import re
+
+from pathlib import Path
+
+import polib
+
+
+placeholder_regexp = re.compile(r'\{[^\}]*?\}')
+
+for path in Path(__file__).parent.resolve().parent.rglob('LC_MESSAGES/*.po'):
+    po = polib.pofile(path)
+    for entry in po:
+        if not entry.msgstr:
+            continue  # ignore untranslated strings
+
+        expected_placeholders = set(placeholder_regexp.findall(entry.msgid))
+        actual_placeholders = set(placeholder_regexp.findall(entry.msgstr))
+        if expected_placeholders != actual_placeholders:
+            print("Invalid string at %s line %d:" % (path, entry.linenum))
+            print("\toriginal string %r has placeholders: %r" % (entry.msgid, expected_placeholders))
+            print("\ttranslated string %r has placeholders: %r" % (entry.msgstr, actual_placeholders))
+            print()

setup.py

@@ -68,6 +68,9 @@ testing_extras = [
     # django-taggit 1.3.0 made changes to verbose_name which affect migrations;
     # the test suite migrations correspond to >=1.3.0
     'django-taggit>=1.3.0,<2.0',
+
+    # for validating string formats in .po translation files
+    'polib>=1.1,<2.0',
 ]
 
 # Documentation dependencies