add fallback on en locale

| Q                    | A
| -------------------- | ---
| Bug fix?             | Kind of
| New feature?         | No
| BC breaks?           | No
| CI currently passes? | 
| Tests pass?          | Yes
| Scenarios pass?      | Yes
| Checkstyle issues?*  | No
| PMD issues?**        | No
| Changelog updated?   | Yes
| Fixed tickets        | PIM-3123
| Doc PR               |