Make "No $entity selected" errors more accurate (#19356)

Previously all controllers would use the single "No accounts changed as
none were selected" message. This commit changes them to read "tags",
"posts", "emojis", etc. where necessary.

app/controllers/admin/custom_emojis_controller.rb

@@ -34,7 +34,7 @@ module Admin
       @form = Form::CustomEmojiBatch.new(form_custom_emoji_batch_params.merge(current_account: current_account, action: action_from_button))
       @form.save
     rescue ActionController::ParameterMissing
-      flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+      flash[:alert] = I18n.t('admin.custom_emojis.no_emoji_selected')
     rescue Mastodon::NotPermittedError
       flash[:alert] = I18n.t('admin.custom_emojis.not_permitted')
     ensure

app/controllers/admin/trends/links/preview_card_providers_controller.rb

@@ -14,7 +14,7 @@ class Admin::Trends::Links::PreviewCardProvidersController < Admin::BaseControll
     @form = Trends::PreviewCardProviderBatch.new(trends_preview_card_provider_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
-    flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+    flash[:alert] = I18n.t('admin.trends.links.publishers.no_publisher_selected')
   ensure
     redirect_to admin_trends_links_preview_card_providers_path(filter_params)
   end

app/controllers/admin/trends/links_controller.rb

@@ -15,7 +15,7 @@ class Admin::Trends::LinksController < Admin::BaseController
     @form = Trends::PreviewCardBatch.new(trends_preview_card_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
-    flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+    flash[:alert] = I18n.t('admin.trends.links.no_link_selected')
   ensure
     redirect_to admin_trends_links_path(filter_params)
   end

app/controllers/admin/trends/statuses_controller.rb

@@ -15,7 +15,7 @@ class Admin::Trends::StatusesController < Admin::BaseController
     @form = Trends::StatusBatch.new(trends_status_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
-    flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+    flash[:alert] = I18n.t('admin.trends.statuses.no_status_selected')
   ensure
     redirect_to admin_trends_statuses_path(filter_params)
   end

app/controllers/admin/trends/tags_controller.rb

@@ -14,7 +14,7 @@ class Admin::Trends::TagsController < Admin::BaseController
     @form = Trends::TagBatch.new(trends_tag_batch_params.merge(current_account: current_account, action: action_from_button))
     @form.save
   rescue ActionController::ParameterMissing
-    flash[:alert] = I18n.t('admin.accounts.no_account_selected')
+    flash[:alert] = I18n.t('admin.trends.tags.no_tag_selected')
   ensure
     redirect_to admin_trends_tags_path(filter_params)
   end