The way in which this key works is that it is used to show an unrecognized activity. Because of the way in which the activity stream specification works, this verb is not going to be conjugated and will be something like "update", "create", etc. Therefore, I think a translation along the following lines is going to work better:

```
<a href="${actor1URL}">${actor1}</a> a fait l'action &quot;${verb}&quot;
```