Translation of munter

Let's not forget how we started. We were writing each other very long messages and today we are both much more fluent in both languages. No book could have brought us that far. Cheers.
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.
But we learned only the general rules such as personal pronouns and articles, accents, some verbs and general vocabulary. I also love the sea and the sun, and the beautiful mountains too.