Add two screenshots for 'Unlock VeraCrypt Volumes'

wiki/src/doc/encryption_and_privacy/veracrypt.mdwn

@@ -112,6 +112,8 @@ Unlocking a file container without keyfiles
      <span class="guisubmenu">Utilities</span>&nbsp;▸
      <span class="guisubmenuitem">Unlock VeraCrypt Volumes</span></span>.
 
+   [[!img unlock-veracrypt-volumes.png link="no" alt=""]]
+
 1. Click <span class="button">Add</span> and choose the file container
    that you want to unlock.
 
@@ -236,9 +238,7 @@ Unlocking a partition or drive without keyfiles
 1. In the list of partitions, click <span class="button">Unlock</span> in the
    line that corresponds to your USB stick or hard disk.
 
-   [[!img partition-encrypted-label.png link="no" alt="Mount and open '8.2 GB Encrypted'"]]
-
-   XXX: Update screenshot
+   [[!img unlock-veracrypt-volumes-with-partition.png link="no" alt=""]]
 
 1. Enter the parameters to unlock the volume. For more information, see
    the [[Unlocking parameters|veracrypt#parameters]] section above.