Set config.i18n.available_locales explicitly

Rails-i18n's bundled locale data means an unset available_locales
defaults to every locale it ships pluralization/date rules for --
several hundred, not the two this app actually supports. Harmless
everywhere the outer route scope's own /de|en/ regex already
narrowed whatever reached I18n.available_locales.include?(...), but
the first code to read the list directly (Page.non_default_locales)
took it at face value. Also closes a related, independently-silent
gap in Page#rewrite_links_in_body, which used the same unconstrained
list to decide whether a link was already locale-prefixed.

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