Extend whiteboard model to allow targetted messages

The targetting can be done on:

- component
- project
- language

Issue #159
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/migrations/0049_auto_20151222_0949.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2015-12-22 09:49
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('lang', '0002_auto_20150630_1208'),
+        ('trans', '0048_auto_20151120_1306'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='whiteboardmessage',
+            name='language',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='lang.Language'),
+        ),
+        migrations.AddField(
+            model_name='whiteboardmessage',
+            name='project',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='trans.Project'),
+        ),
+        migrations.AddField(
+            model_name='whiteboardmessage',
+            name='subproject',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='trans.SubProject'),
+        ),
+        migrations.AlterField(
+            model_name='whiteboardmessage',
+            name='message',
+            field=models.TextField(verbose_name='Message'),
+        ),
+    ]

weblate/trans/models/whiteboard.py

@@ -22,10 +22,17 @@
 
 from django.db import models
 from django.utils.translation import ugettext_lazy
+from weblate.lang.models import Language
 
 
 class WhiteboardMessage(models.Model):
-    message = models.TextField(blank=True)
+    message = models.TextField(
+        verbose_name=ugettext_lazy('Message'),
+    )
+
+    project = models.ForeignKey('Project', null=True, blank=True)
+    subproject = models.ForeignKey('SubProject', null=True, blank=True)
+    language = models.ForeignKey(Language, null=True, blank=True)
 
     class Meta(object):
         app_label = 'trans'