Fix performance issue with the portal module.
Fix performance issue with the portal module.

When the module tries to build up a menu, it instantiates a new "random" template (from another module, sanitycheck) to get a translator that it can use to translate the menu options. This is awfully wrong, as it forces SSP to load another template, reinit Twig, the translation system, and so on. Instead, a new instance of SimpleSAML\Locale\Translate should be more than enough.

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