Task name filter: task label changes language when user clicks on the Filter button

Steps to reproduce:

1. Choose French as your language in your preferences.
2. Start one or several workflows.
3. In the Workflow tab, select a task in filter's Task name list (for instance "[Revue en parallèle] Donner son opinion").
4. Click on the Filter button.
   => In the Task name list, the task is displayed in English ("[Parallel document review] Give your opinion").