[BUGFIX] Hide language switcher if record has no default translation

Disable further language menu options in free mode. If language record
doesn't have a record in the default language there are no more options
in the language menu needed.

Resolves: #72797
Releases: master, 7.6
Change-Id: Ic5211f99c3c53f3097057ba580e3394896b81170
Reviewed-on: https://review.typo3.org/50298


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Josef Glatz <josef.glatz@typo3.org>
Tested-by: Josef Glatz <josef.glatz@typo3.org>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>