first commit

wp-content/plugins/mailchimp-for-wp/config/default-form-content.php

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+<?php
+
+$email_label       = esc_html__('Email address', 'mailchimp-for-wp');
+$email_placeholder = esc_html__('Your email address', 'mailchimp-for-wp');
+$signup_button     = esc_html__('Sign up', 'mailchimp-for-wp');
+
+$content  = "<p>\n\t<label>{$email_label}: \n";
+$content .= "\t\t<input type=\"email\" name=\"EMAIL\" placeholder=\"{$email_placeholder}\" required />\n</label>\n</p>\n\n";
+$content .= "<p>\n\t<input type=\"submit\" value=\"{$signup_button}\" />\n</p>";
+
+return $content;

wp-content/plugins/mailchimp-for-wp/config/default-form-messages.php

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+<?php
+
+return array(
+    'subscribed'             => array(
+        'type' => 'success',
+        'text' => esc_html__('Thank you, your sign-up request was successful! Please check your email inbox to confirm.', 'mailchimp-for-wp'),
+    ),
+    'updated'                => array(
+        'type' => 'success',
+        'text' => esc_html__('Thank you, your records have been updated!', 'mailchimp-for-wp'),
+    ),
+    'unsubscribed'           => array(
+        'type' => 'success',
+        'text' => esc_html__('You were successfully unsubscribed.', 'mailchimp-for-wp'),
+    ),
+    'not_subscribed'         => array(
+        'type' => 'notice',
+        'text' => esc_html__('Given email address is not subscribed.', 'mailchimp-for-wp'),
+    ),
+    'error'                  => array(
+        'type' => 'error',
+        'text' => esc_html__('Oops. Something went wrong. Please try again later.', 'mailchimp-for-wp'),
+    ),
+    'invalid_email'          => array(
+        'type' => 'error',
+        'text' => esc_html__('Please provide a valid email address.', 'mailchimp-for-wp'),
+    ),
+    'already_subscribed'     => array(
+        'type' => 'notice',
+        'text' => esc_html__('Given email address is already subscribed, thank you!', 'mailchimp-for-wp'),
+    ),
+    'required_field_missing' => array(
+        'type' => 'error',
+        'text' => esc_html__('Please fill in the required fields.', 'mailchimp-for-wp'),
+    ),
+    'no_lists_selected'      => array(
+        'type' => 'error',
+        'text' => esc_html__('Please select at least one list.', 'mailchimp-for-wp'),
+    ),
+);

wp-content/plugins/mailchimp-for-wp/config/default-form-settings.php

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+<?php
+
+return array(
+    'css'                => 0,
+    'double_optin'       => 1,
+    'hide_after_success' => 0,
+    'lists'              => array(),
+    'redirect'           => '',
+    'replace_interests'  => 1,
+    'required_fields'    => '',
+    'update_existing'    => 0,
+    'subscriber_tags'    => '',
+);

wp-content/plugins/mailchimp-for-wp/config/default-settings.php

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+<?php
+
+return array(
+    'api_key'              => '',
+    'allow_usage_tracking' => 0,
+    'debug_log_level'      => 'warning',
+);