Unescape escaped straight apostrophes (#3021)

* Unescape escaped straight apostrophes

* Fix copy-paste error.

Co-authored-by: Eemeli Aro <eemeli@gmail.com>

pontoon/base/migrations/0050_strings_xml_apostrophes.py

@@ -0,0 +1,44 @@
+# Generated by Django 3.2.15 on 2023-11-15 00:23
+
+from django.db import migrations
+from django.db.models import Value
+from django.db.models.functions import Replace
+
+
+def unescape_strings_xml_apostrophes(apps, schema_editor):
+    Entity = apps.get_model("base", "Entity")
+    entities = Entity.objects.filter(
+        resource__format="xml",
+        string__contains="\\'",
+    )
+    entities.update(string=Replace("string", Value("\\'"), Value("'")))
+
+    Translation = apps.get_model("base", "Translation")
+    translations = Translation.objects.filter(
+        entity__resource__format="xml",
+        string__contains="\\'",
+    )
+    translations.update(string=Replace("string", Value("\\'"), Value("'")))
+
+    TranslationMemoryEntry = apps.get_model("base", "TranslationMemoryEntry")
+    tm_entries = TranslationMemoryEntry.objects.filter(
+        entity__resource__format="xml",
+    )
+    source_tm_entries = tm_entries.filter(source__contains="\\'")
+    source_tm_entries.update(source=Replace("source", Value("\\'"), Value("'")))
+    target_tm_entries = tm_entries.filter(target__contains="\\'")
+    target_tm_entries.update(target=Replace("target", Value("\\'"), Value("'")))
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("base", "0049_fix_pluralform_data"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            code=unescape_strings_xml_apostrophes,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]