(Not a blocker for wiki creation.)
The following strings shold be localised:
Aliases
/** English (English) */ $specialPageAliases['en'] = [ 'Gadgets' => [ 'Gadgets' ], 'GadgetUsage' => [ 'GadgetUsage' ], ];
Namespaces
$namespaceNames['en'] = [ NS_GADGET => 'Gadget', NS_GADGET_TALK => 'Gadget_talk', NS_GADGET_DEFINITION => 'Gadget_definition', NS_GADGET_DEFINITION_TALK => 'Gadget_definition_talk', ];