* Use native go method to get current user rather than environment var

* Use t.Skip instead of return in test

Executed go fmt

getEngine() not handles DB parameters (#2972) (#2974)

Uses .AllCols() for Update in updateMirror()

Spanish traslation removed

Fixed a wrong way to ommit the --prune option in process.ExecDir() for MirrorUpdate function

The same logic was duplicated in three places. Factor it
out so that we can add further fallbacks in a single place.