Some JavaScript strings are missing translation

[pedro-mendonca]

Hi :)

While translating the plugin, I've found that some strings aren't correctly i18n'zed.

Here is an example of the dropdown of More Options on field edit:

Steps to reproduce:

1. Set locale to a non-en_US language that has translation (e.g. Portuguese)
2. Edit a form and check the options in the dropdown as shown above.