comfirmation at import force

[denbatte]

At translations in back end settings you have a import button with 2 choices. One of them is import forced where the system clears the database and reloads the translation file. This is a dangerous action and I think it could be helpful to ask for confirmation when doing this action.

[LiesbethVanaerschot]

@diskwriter this can be closed, the confirmation message has already been added.