Simple commit of missing i18n keys from Japanese

[johnnyshields]

No description provided.

[seanlinsley]

Thanks for this! Feel free to add any others that might be missing.

I should note that it's easy to update translations without waiting for changes to be pulled into the Active Admin source:

# in config/locales/ja.yml
ja:
  active_admin:
    create_model: "%{model} を作成する"  

[johnnyshields]

Cool, I think ja.yml should be in-sync with en.yml now.

[johnnyshields]

Can this be merged please?

[johnnyshields]

Thanks 👍