Redirect a global URL request to translated version, if available

[mshmsh5000]

User story (primary): anonymous -> 301

• If I am an anonymous visitor,
• and I am making a request from a country where we provide translated content (e.g., Mexico),
• and I request a bare URL (e.g., /campaigns/sample),
• and there is a translation available (e.g., /voluntario/ejemplo),
• then issue a 301 redirect to the translation's URL.

User story (secondary): authenticated -> 302

• If I am an authenticated visitor,
• and my profile includes a language preference,
• and I request a bare URL (e.g., /campaigns/sample),
• and there is a translation available (e.g., /voluntario/ejemplo),
• then issue a 302 redirect to the translation's URL.

Clues

• Custom logic here, based on the stock Translation Redirect behavior
• [https://www.drupal.org/project/multilink](MultiLink Redirect), "A module which might save a lot of work...if you have content in two or more languages."