Add collapsible inlines support. (#282)

* Improve code formatting.

* Add collapsible inlines frontend support.

* Add collapsible inlines options fields to model and admin.

* Add option classes to body.

* Update translations.

* Update README.md

admin_interface/migrations/0030_theme_collapsible_stacked_inlines_and_more.py

@@ -0,0 +1,42 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("admin_interface", "0029_theme_css_generic_link_active_color"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="theme",
+            name="collapsible_stacked_inlines",
+            field=models.BooleanField(
+                default=False,
+                verbose_name="collapsible stacked inlines",
+            ),
+        ),
+        migrations.AddField(
+            model_name="theme",
+            name="collapsible_stacked_inlines_collapsed",
+            field=models.BooleanField(
+                default=True,
+                verbose_name="collapsible stacked inlines collapsed",
+            ),
+        ),
+        migrations.AddField(
+            model_name="theme",
+            name="collapsible_tabular_inlines",
+            field=models.BooleanField(
+                default=False,
+                verbose_name="collapsible tabular inlines",
+            ),
+        ),
+        migrations.AddField(
+            model_name="theme",
+            name="collapsible_tabular_inlines_collapsed",
+            field=models.BooleanField(
+                default=True,
+                verbose_name="collapsible tabular inlines collapsed",
+            ),
+        ),
+    ]