Log found duplicate strings

Issue #693
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/models/changes.py

@@ -150,6 +150,7 @@ class Change(models.Model):
     ACTION_NEW_SOURCE = 13
     ACTION_LOCK = 14
     ACTION_UNLOCK = 15
+    ACTION_FOUND_DUPLICATE = 16
 
     ACTION_CHOICES = (
         (ACTION_UPDATE, ugettext_lazy('Resource update')),
@@ -168,6 +169,7 @@ class Change(models.Model):
         (ACTION_NEW_SOURCE, ugettext_lazy('New source string')),
         (ACTION_LOCK, ugettext_lazy('Component locked')),
         (ACTION_UNLOCK, ugettext_lazy('Component unlocked')),
+        (ACTION_FOUND_DUPLICATE, ugettext_lazy('Detected duplicate string')),
     )
 
     unit = models.ForeignKey('Unit', null=True)

weblate/trans/models/translation.py

@@ -460,6 +460,10 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
 
         if change is None:
             change = Change.ACTION_UPDATE
+        if request is None:
+            user = None
+        else:
+            user = request.user
 
         # Check if we're not already up to date
         if self.revision != self.get_git_blob_hash():
@@ -512,6 +516,13 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
                     newunit,
                     repr(newunit.source)
                 )
+                Change.object.create(
+                    unit=newunit,
+                    translation=self,
+                    action=Change.ACTION_FOUND_DUPLICATE,
+                    user=user,
+                    author=user
+                )
 
             # Store current unit ID
             created_units.add(newunit.id)
@@ -540,10 +551,6 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
             self.invalidate_cache()
 
         # Store change entry
-        if request is None:
-            user = None
-        else:
-            user = request.user
         Change.objects.create(
             translation=self,
             action=change,