Add translatable labels to whiteboard admin

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

weblate/trans/migrations/0051_auto_20151222_1059.py

+# -*- coding: utf-8 -*-
+# Generated by Django 1.9 on 2015-12-22 10:59
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('trans', '0050_auto_20151222_1006'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='whiteboardmessage',
+            name='language',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='lang.Language', verbose_name='Language'),
+        ),
+        migrations.AlterField(
+            model_name='whiteboardmessage',
+            name='project',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='trans.Project', verbose_name='Project'),
+        ),
+        migrations.AlterField(
+            model_name='whiteboardmessage',
+            name='subproject',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, to='trans.SubProject', verbose_name='Component'),
+        ),
+    ]

weblate/trans/models/whiteboard.py

@@ -65,9 +65,24 @@ class WhiteboardMessage(models.Model):
         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)
+    project = models.ForeignKey(
+        'Project',
+        verbose_name=ugettext_lazy('Project'),
+        null=True,
+        blank=True,
+    )
+    subproject = models.ForeignKey(
+        'SubProject',
+        verbose_name=ugettext_lazy('Component'),
+        null=True,
+        blank=True
+    )
+    language = models.ForeignKey(
+        Language,
+        verbose_name=ugettext_lazy('Language'),
+        null=True,
+        blank=True
+    )
 
     objects = WhiteboardManager()