Workaround: problem with language in snapshotter

snapshotter-stuff.m

In your test file

- (NSString*)localizedString:(NSString *)key
{
    NSString *language = _snapshotter._deviceLanguage;
    NSString *translation = nil;
    
    if(language)
    {
        language = [language stringByReplacingCharactersInRange:NSMakeRange(2, language.length-2) withString:@""];
        
        NSBundle *bundle = [NSBundle bundleForClass:[self class]];
        NSString *path =  [bundle pathForResource:language ofType:@"lproj"];
        NSBundle *bundlelocalized = [NSBundle bundleWithPath:path];
        translation = [bundlelocalized localizedStringForKey:key value:@"" table:nil];;
    }
    
    return translation;
}


In your Snapshot Helper

- (void)setLanguage
{
    NSString* path = @"/tmp/language.txt";
    
    NSError* error;
    NSString* locale = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];
    _locale = [NSLocale localeWithLocaleIdentifier:locale];
    if (error)
    {
        NSLog(@"❌ %s could not detect language. Falling back to device locale. %@", __PRETTY_FUNCTION__, error);
        _locale = [NSLocale currentLocale];
        locale = [_locale objectForKey:NSLocaleIdentifier];
    }
    
    if (   _locale
        && locale)
    {
        NSUInteger idx = 2;
        if (locale.length < idx)
        {
            idx = locale.length;
        }
        _deviceLanguage = [locale substringToIndex:idx];
        _app.launchArguments = [_app.launchArguments arrayByAddingObjectsFromArray:@[@"-AppleLanguages",[NSString stringWithFormat:@"(%@)", _deviceLanguage],@"-AppleLocale",locale, @"-ui_testing"]];
    }
}