Prepare the plugin for localization

[stefan-cotitosu]

What problem does this address?

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

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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

Shorten the changelog in the readme file

In the readme.txt file, remove changelogs from all previous versions. Retain only the most recent changelog and provide a link to GitHub for changelogs of previous versions. Here is an example of how was this implemented before.

Current behavior vs Expected behavior

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Will this feature require documentation? (Optional)

No.