I have a comment about the following:
-Ayer tomamos una decisión. -Habréis tomado una decisión, pero el problema surgirá de nuevo, estoy seguro.-We took a decision yesterday. -You may have taken a decision, but this problem will come up again, I am sure.I have checked a lot of resources (people I know, as well as reliable British English online resources), and the correct phrase with "decision" is "to make a decision." Thus, it should be: "We made a decision yesterday." and "You may have made a decision but ..." Thank you.