Some errors are in German

[andreademasi]

Hey, thanks for the awesome library! I noticed some errors are in German while others are in English, it would be better if they were all in English for uniformity and simplicity.

react-native-laravel-sanctum/src/hooks/useAuth.ts

Line 7 in 674df4d

throw new Error('useAuth muss innerhalb von AuthProvider verwendet werden');

[Tschucki]

I will fix that