Added unique constraint on option translations

| Q                    | A
| -------------------- | ---
| Bug fix?             | No
| New feature?         | No
| BC breaks?           | No
| CI currently passes? | ?
| Tests pass?          | N/A
| Scenarios pass?      | N/A
| Checkstyle issues?   | N/A
| Changelog updated?   | No
| Fixed tickets        |
| Doc PR               |