[BUGFIX] LanguagePackCommand: Hide progress output by default

Show progress bar only if verbosity level is set. The default output
of this command is disabled by default to limit the amount of e-mails
sent by the TYPO3 scheduler (which normally makes only sense, if any
error occurs).

You can activate the output if you set the verbosity while calling the
command ("-v" option).

Resolves: #85533
Releases: master
Change-Id: I6f95559cc1228afd66192f7382e81f9ae91c0ed8
Reviewed-on: https://review.typo3.org/57530


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Alexander Grein <alexander.grein@gmail.com>
Reviewed-by: Mathias Brodala <mbrodala@pagemachine.de>
Tested-by: Mathias Brodala <mbrodala@pagemachine.de>