Default text in forms is not localized

[fjarrett]

Ideally, the default text inside sign up forms should be translated on-the-fly.

[robertsky]

@fjarrett I am a zh_CN PTE on translate.wordpress.org. I was processing your strings and and it came to my attention that translate.wordpress.org has thrown an error for this plugin.

To shed more light, the text domain needs to match your plugin slug on wordpress.org. See: How to Internationalize Your Plugin - Text Domain

This is the error that is thrown up by the system (can be seen in wordpress.org's slack):

Import of godaddy-email-marketing-sign-up-forms
Time: Sat, 11 Feb 2017 01:16:21 +0000, Development Log
Code for stable (godaddy-email-marketing-sign-up-forms/tags/1.2.0/) in process...
This plugin has a wrong text domain declaration in the file header:
./godaddy-email-marketing.php: * Text Domain: godaddy-email-marketing
Code for stable was processed.
Readme for stable (godaddy-email-marketing-sign-up-forms/tags/1.2.0/) in process...
The GlotPress projects were updated.
Result of the POT import: 3 new strings added, 0 updated, 0 fuzzied, and 0 obsoleted.
Readme for stable was processed.

I have created a pull request (#26) as well to reflect the required change. Please verify and accept the pull request when verified. :)