Translation of mangelhaft

Dear Maximilian, I look forward to your visit in Switzerland. After a somewhat difficult start, it seems that we have increased the website traffic and we are starting to receive more visitors.
True, I forgot the 'I' when I have copied and pasted the entire text field. I assume it is the regular form, isn't it? However, the formal form in Spain is a little different to what we are using in Mexico.
Did you have fun with your family? What is your mother tongue? Thanks for your answer, I have understood everything. I have a brother who lives in Panama! I wish you a nice weekend.