language update  refs #3430
Merge pull request #6596 from piwik/translationupdates

[automatic translation update] Updated 121 strings in 19 languages (cs, da, de, fa, it, ja, pl, sv, pt, hi, fi, ru, sr, tr, ro, fr, nl, el, es)
Fixes #6595 Test of the minimum PHP version
refs #6508 add some comments
refs #6508 started refactoring the code, created two new objects: ArchiveInvalidator to include the API CoreAdminHome.invalidateArchivedReports and InvalidatedReports to store the info of which report was invalidated
refs #6508 log when invalid dates were found in the input
Submodules
Revert "Fixes #6595 Test of the minimum PHP version"

This reverts commit 6c1a90ff497bf4a6a23f55317f90d9749c6576fe.
refs #6508 some refactoring and renaming
fixes  #6598 Add sites to be invalidated when the archiving failed to make sure we try to reprocess again later
refs #6508 Now we will purge only the right  monthly archive_numeric table and also only for the websites IDs that were invalidated
Fix travis template for plugin coverage
.travis.yml file is out of date, auto-updating .travis.yml file.
fixes #6508 it works, although unfortunately not with automated tests
Merge remote-tracking branch 'origin/master'
submodules
Move code to generate console command from InputInterface to ConsoleCommand class (for reuse in another command).
Allow host to be omitted in URLs to CliMulti and to the RequestCommand command.
Adding initial benchmarking command. Tested benchmarking a URL locally, but nothing else.
Fixing running benchmarks on AWS (have to upload fixture & benchmark files to EC2 instance).