Why some translations are missing?
The default language of Akeneo PIM is English, and for other languages we use Crowdin. Crowdin is a localisation project management collaboration platform and translation service for developers and business owners.
It is a free project based on individual contributions, as soon as a new key for translation is available, members can help translate it in any language.
So if you are noticing missing translations, it might be available for translation on Crowdin project. Please refer to https://crowdin.com/project/akeneo to collaborate to Akeneo’s translations.