Refactor method to get custom texts translations

It was a bit confusing to return `false` in the method and then handle
this case in the view.

app/components/admin/site_customization/information_texts/form_field_component.html.erb

@@ -1,7 +1,7 @@
 <% globalize(locale) do %>
   <%= hidden_field_tag "contents[content_#{i18n_content.key}][id]", i18n_content.key %>
   <%= text_area_tag "contents[content_#{i18n_content.key}]values[value_#{locale}]",
-                    text || t(i18n_content.key, locale: locale),
+                    text,
                     rows: 5,
                     class: "js-globalize-attribute",
                     style: site_customization_display_translation_style(locale),

app/components/admin/site_customization/information_texts/form_field_component.rb

@@ -10,10 +10,16 @@ class Admin::SiteCustomization::InformationTexts::FormFieldComponent < Applicati
   private
 
     def text
+      database_text || i18n_text
+    end
+
+    def database_text
       if i18n_content.present?
-        I18nContentTranslation.find_by(i18n_content_id: i18n_content.id, locale: locale)&.value
-      else
-        false
+        i18n_content.translations.find_by(locale: locale)&.value
       end
     end
+
+    def i18n_text
+      t(i18n_content.key, locale: locale)
+    end
 end