Force translation files download instead of skipping them (#1169023)
    
    It seems that 'tx pull' by default skips "already downloaded" files without
    checking them in any way. Thus it easily happens that totally wrong translation
    files (even from a different branch) are used instead of the new proper ones.
    
    We don't pull translations that often so that we would need to avoid unnecessary
    downloads for the price of easily getting wrong translations in builds and we
    should thus force translations file downloads.