we have 2 modi in that window:
* backup has multiple datastores
* backup has single datastore
In the first case we show a 'mapping' grid so that
the user can only restore a part. Here a user sees all source
Datastores and can select a target for each one.
In the second case we only have a single 'Datastore' selector, but
we do not show the source. Because of this, the naming is slightly ambiguous
(is it the 'Source' or the 'Target' ?), so rename it to 'Target Datastore'.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
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