Description of problem:

Some user-facing text and message ares not translated into Japanese.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

Add the following `i18n` section to the `app-config.yaml`, and select Japanese from the Appearance panel in the Settings page.

```

i18n:

    locales:

    - en

    - ja

```

Actual results:

Several UI elements remain in English (see attached screenshots).

Expected results:

All user-facing text should be localized into Japanese.

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

Additional info (Such as Logs, Screenshots, etc):