Spanish server translation

I'm aiming for a full spanish locale files translation. But there're some words that I believe that will be better to talk about with you instead of me making a single decision (I don't have also a good translation for some of them!)

Here is a list of some words that I've found and some of my suggestions:

* **Flags** Marcador
* **Topics** Topics
* **Posts** Posts
* **Like** Like sometimes and 'Me gusta' others
* **Best** of Los mejores
* **Poster** Poster
* **Pinned** ??

Maybe @xtream would like to give some opinions.