Language switcher: theme data reference

Reading the data tables. Presence varies by page and state; this is not a requirement to populate every field.

Field	Type	Meaning	Availability
viewModel.languageSwitcher	object	Language switcher data; check child fields before use.	When the parent is provided; check optional fields.
viewModel.languageSwitcher.currentIsoCode	string	Current iso code value supplied for this context.	When the parent is provided; check optional fields.
viewModel.languageSwitcher.currentLabel	string	Prepared current display text.	When the parent is provided; check optional fields.
viewModel.languageSwitcher.currentLanguageId	number	current language identifier; do not load data with it.	When the parent is provided; check optional fields.
viewModel.languageSwitcher.isEnabled	boolean	Whether enabled applies; use for display only.	When the parent is provided; check optional fields.
viewModel.languageSwitcher.items	array	Prepared items collection; may be empty.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].isActive	boolean	Whether active applies; use for display only.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].isDefault	boolean	Whether default applies; use for display only.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].isoCode	string	Iso code value supplied for this context.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].label	string	Label value supplied for this context.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].languageId	number	language identifier; do not load data with it.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].shortLabel	string	Prepared short display text.	Items exist when more than one storefront language is enabled; otherwise the array is empty.
viewModel.languageSwitcher.items[].url	string	Prepared url URL; use unchanged.	Items exist when more than one storefront language is enabled; otherwise the array is empty.