Restore admin interface

- `Category`,
- `FundingCategory`,
- `Language`,
- `MusicFocus`,
- `Topic`,
- `Type`

program/admin.py

+from django.contrib import admin
+from program.models import Category, FundingCategory, Language, MusicFocus, Topic, Type
+
+
+class AdminWithNameSlugIsActive(admin.ModelAdmin):
+    list_display = ("name", "slug", "is_active")
+
+
+class LanguageAdmin(admin.ModelAdmin):
+    list_display = ("name", "is_active")
+
+
+admin.site.register(Category, AdminWithNameSlugIsActive)
+admin.site.register(FundingCategory, AdminWithNameSlugIsActive)
+admin.site.register(Language, LanguageAdmin)
+admin.site.register(MusicFocus, AdminWithNameSlugIsActive)
+admin.site.register(Topic, AdminWithNameSlugIsActive)
+admin.site.register(Type, AdminWithNameSlugIsActive)