Save translated select field value upon page saving

The CMS Questions
1

I have a select field, and I want its selected value to be automatically translated upon page saving.
I don’t know if this is the best way, but I thought of creating a page.update.after hook to do the translation:

'page.update:after' => function($newPage, $oldPage) {
  if ((string) $newPage->intendedTemplate() === 'variation-custom') {
    try {
      $page_en = $newPage->update([
        'material' => 'translated value',
      ], 'en'); // en is the secondary language
    } catch(Exception $e) {
      echo $e->getMessage();
    }
  }
}

With this code, if I have translate: false for the material field in the blueprint, the field is not saved in the specified language file. Otherwise, it is saved but it’s value is blank.

2

The right way to go about this would be to add the translation strings in the language files, then use the t() helper when rendering the value in templates etc.

3

Sorry, forgot to mention that these translations will be fetched dynamically from a database.

4

But the update code is supposed to update a page in the filesystem, not in the database?

Maybe update the translation files programmatically. Or store the value in a 'material_en`etc. field per language