Use translatable strings for literals

Problem/Motivation

Untranslated literals still exist in the code. From https://www.drupal.org/project/mailchimp/issues/2932189#comment-15334908 🐛 Translate confirmation message and submit button Fixed ,

You could search in the code base for:

'#title' => '
'#title' => "

Steps to reproduce

Proposed resolution

Review the code for untranslated string literals and apply translation.

Remaining tasks

User interface changes

API changes

Data model changes