NSString *targetId = @"toFind";
    NSMutableArray *results = [NSMutableArray new];
    for (NSDictionary *element in _categoryDictionary) {
        NSArray *subcategories = element[@"subcategories"];
        for (NSDictionary *aSubcategory in subcategories) {
            if ([aSubcategory[@"id"] isEqualToString:targetId]) {
                [results addObject:aSubcategory[@"locale"]];
            }
        }
    }