12. Translating content

Content entities can be made translatable in the storage by amending the entity type attributes. However, this by itself does not make the content entity translatable in the user interface. It only allows site builders to make it translatable in the user interface with the Content Translation module.

12.1. Install the Content Translation module

Install the Content Translation module on /admin/modules
Add a second language on /admin/config/regional/language
Visit /admin/config/regional/content-language

Note that events cannot be selected for translation.

12.2. Make events translatable

Delete all existing events
Delete the Events and Event teaser views
Add the following to the attributes in src/Entity/Event.php:
```
translatable: TRUE,
data_table: 'event_field_data',
```

Add the following to the entity_keys part of the attributes in src/Entity/Event.php:
```
'langcode' => 'langcode',
```
Like for the id, uuid and type fields, the field definition for the langcode field is automatically generated by ContentEntityBase::baseFieldDefinitions().
Run drush entity:updates

Note that the {event_field_data} table has been created and the type column has been added to the {event} table.
Verify that Events can be marked as translatable

Note that only the Comments field is translatable.
Add the following to field definitions for the title, description, published, path and changed fields in the baseFieldDefinitions() method of the Event class before the semicolon:
```
->setTranslatable(TRUE)
```
Run drush entity:updates
Mark all fields of all event types as translatable
Add an event entity

Note there is a Translate local task

Notice the following exception is thrown when visiting the Translate local task:
```
The "event" entity type did not specify a "default" form class.
```

Add the following to the form handlers part of the attributes in src/Entity/Event.php:
```
'default' => EventForm::class,
```
Rebuild caches

Run drush cache:rebuild
Translate entity

Note that non-translatable fields are still shown. Editing these will change the values in the source translation
Verify that translation works

Re-add the Events view