Add missing sqlite3 extension to require-dev as it is needed for the unit tests.

Memcache server always seen as down when using moxi

Now also considers any attributes.po in the configured theme, if any.
Makes the attributes.extradictionary config setting obsolete.

Fix entity data size for MySQL

Scrutinizer Auto-Fixes

This commit consists of patches automatically generated for this project on https://scrutinizer-ci.com

We could use it everywhere, but it's better to reduce the already big
amount of configuration options the admin is confronted with than the
small problem this option solves.

Reimplement getPreferredTranslation outside of IdPDisco so it's reusable
and much more complete. The new method will search the current, default
and fallback language for a displayable string in various metadata
fields. This should be much more complete and robust than previous
approches. Make it a Twig filter so it can also be used there.