Add new activities icon
It is required to import and overwrite the BASE
module translation files found in the card:
https://trello.com/c/c9RnMH8g/336-10-menu-principal-el-acceso-a-la-vista-tree-de-actividades-se-debe-hacer-desde-un-punto-de-men%C3%BA-propio-con-nombre-actividades
Keeping the spanish po file as "es_ES.po" and the catalan "ca_ES.po"