fixup! fixup! web: no need initialize web site languages

Tests asserts that size have all languages available, so let's be
compatible and just set the default language to the current selected
one at site creation.

bt5/erp5_web/SkinTemplateItem/portal_skins/erp5_web/WebSite_init.py

@@ -6,6 +6,7 @@
 context.setContainerLayout('erp5_web_layout')
 context.setContentLayout('erp5_web_content_layout')
 context.setLayoutConfigurationFormId('WebSection_viewDefaultThemeConfiguration')
-# At least one available language is required
-context.setAvailableLanguageSet([context.Localizer.get_selected_language()])
+localizer = context.getPortalObject().Localizer
+context.setAvailableLanguageSet(localizer.get_supported_languages())
+context.setDefaultAvailableLanguage(localizer.get_selected_language())
 context.setStaticLanguageSelection(1)