XenAPI: Add logging information for cache/download duration

We would like more explicit information on when images are cached.
This commit logs information on whether we are attempting to cache,
whether we downloaded, and how long it took to download.  This
log information can then be used for further processing elsewhere.

Change-Id: Ia971008fabec06c4ba8fc1db4b67474f52604b17
Remove all mostly untranslated PO files

We now only import PO files that are at least 75 % translated,
so we can delete now all other PO files. The patch only
removes the mostly untranslated files. Once a file becomes mostly
translated, the bot will import it again.

This patch leaves the mostly translated language Spanish as
well as US English in.

Change-Id: I1c45fb62bd2bd25fc2b0188be8f9d6903e743851
Closes-Bug: #1317794
Merge "XenAPI: Add logging information for cache/download duration"
Merge "Remove all mostly untranslated PO files"