Display hierarchy when translating taxonomy

When defining groups of taxonomy terms in the Per Language Terms option it is very helpful to have an indication of hierarchy in the drop down boxes just like selecting parents in the core Taxonomy.module.

Example:
In a very simple website for recipes the taxonomy looks as follows:
1. Dinner
1.1. With fat
1.2. For diet
2. Lunch
1.1. With fat
1.2. For diet

In this case the translation will get very confusing as the same text will appear twice without any indication of hierarchy.