old_contents: from django.contrib import admin
  
  from .models import Language, CultureCode
  
  
  class LanguageAdmin(admin.ModelAdmin):
      list_display = ('name_en', 'name_native', 'iso_639_1', 'iso_639_2T', 'iso_639_2B', 'iso_639_2T',
                      'iso_639_3', 'iso_639_6', 'notes')
      list_display_links = ('name_en',)
  
  
  class CultureCodeAdmin(admin.ModelAdmin):
      list_display = ('code', 'language', 'country')
      list_display_links = ('code',)
  
  admin.site.register(Language, LanguageAdmin)
  admin.site.register(CultureCode, CultureCodeAdmin)
  
new_contents: from django.contrib import admin
  
  from .models import Language, CultureCode
  
  
  class LanguageAdmin(admin.ModelAdmin):
      list_display = ('name_en', 'name_native', 'iso_639_1', 'iso_639_2T', 'iso_639_2B', 'iso_639_2T',
                      'iso_639_3', 'iso_639_6', 'notes')
      list_display_links = ('name_en',)
      search_fields = ('name_en', 'name_native')
  
  
  class CultureCodeAdmin(admin.ModelAdmin):
      list_display = ('code', 'language', 'country')
      list_display_links = ('code',)
      search_fields = ('code', 'language', 'country')
  
  admin.site.register(Language, LanguageAdmin)
  admin.site.register(CultureCode, CultureCodeAdmin)
  
subject: Define `search_fields` for Admin classes