Errors

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Most mistakes are type errors first. These are the messages you see at runtime when types were bypassed or a value comes from outside.

Message	Cause
`Unsupported language: 'fr'`	`createUseLang` or `current` returned a language not in `languages`.
text() needs `current` in createLang()	`text()` was called but `createLang()` has no `current`.
`text() expects a text created with t()`	`text()` got a group or object instead of one text.
`Nested object in group() must have exactly one key`	An object passed to `group()` has zero or several keys.
`Duplicate key in group(): Save`	Two items in one `group()` have the same key.
`Texts with parameters need a key in group()`	A function text in `group()` has no custom key.
`Missing translation for lang 'de' at 'key'`	A `t()` lacks a language (only possible by bypassing types).
`Invalid translation object at key 'x'`	A leaf in the tree is not a `t()` result.
`useLang() must be used inside <LangProvider>`	React: `useLang()` was called outside of a provider.