Prepare the plugin for localization

[stefan-cotitosu]

What problem does this address?

We decided to translate Feedzy to German and to achieve this, the following changes need to be applied to the plugin.

What is your proposed solution?

Localize all the strings

• Review all the strings within the PHP and JS files of the plugin to make sure they are fully localized and not hardcoded
• Implement the PHPCS sniff to check for translator comments in the code. Rule to be added: WordPress.WP.I18n.MissingTranslatorsComment

Translate the Formbricks Survey

Reference: Codeinwp/neve@cb3ec00

Will this feature require documentation? (Optional)

No.