feat: restore PO-Revision-Date but with fixed value

External packages are forcing validation on PO-Revision-Date. We need to restore
the metadata to .po file. But we set a fixed value (1970-01-01 00:00:00.000000)
to avoid having a lot of false (git diff) lines

i18n/__init__.py

@@ -6,7 +6,7 @@
 
 from . import config
 
-__version__ = '1.2.0'
+__version__ = '1.3.0'
 
 
 class Runner:

i18n/extract.py

@@ -316,9 +316,9 @@ def fix_metadata(pofile):
         'Last-Translator': '',
         'Language-Team': 'openedx-translation <[email protected]>',
         'Plural-Forms': 'nplurals=2; plural=(n != 1);',
+        'PO-Revision-Date': '1970-01-01 00:00:00.000000',
     }
     pofile.metadata.pop('POT-Creation-Date', None)
-    pofile.metadata.pop('PO-Revision-Date', None)
     pofile.metadata.update(fixes)
 
 

tests/test_extract.py

@@ -177,6 +177,16 @@ def test_metadata_no_create_date(self):
             metadata = po.metadata
             self.assertIsNone(metadata.get('POT-Creation-Date'))
 
+    @perform_extract_with_options()
+    def test_metadata_fixed_revision_date(self):
+        """
+        Verify `PO-Revision-Date` metadata is always set to the same value (1970-01-01 10:30+0000)
+        """
+        for path in self.get_files():
+            po = polib.pofile(path)
+            metadata = po.metadata
+            self.assertEqual(metadata.get('PO-Revision-Date'), '1970-01-01 00:00:00.000000')
+
     @perform_extract_with_options()
     def test_merge_po_files(self):
         """