The old behaviour was that only languages could be used for an app
that are already present in the apps/$app/l10n folder. If there is
a themed l10n that is not present in the apps default l10n folder
the language could not be used and the texts are not translated.

With this change this is possible and also the l10n files are
loaded even if the default l10n doesn't contain the l10n file.

Probably nice for the people that contributed to 9.0 to see themselves in the AUTHORS file :)

ownCloud might not yet be setup. This causes an issue as the user config requires a setup ownCloud. Thus this needs a block whether ownCloud is installed or not.

Fixes https://github.com/owncloud/core/issues/21955

This reverts commit 6a1a4880.