VIRIDIS VICTORIAE EST = Green is for victory
VIS VIRIDIS =Green power
I noticed that you were using the dative form of the adjective "viridis, viridis, viride"(green). The dative is used for indirect objects i.e. Mary in "I gave the ball to Mary. "
Does "green is for victory" mean something like "green means victory" in this context? That is how I take it at first sight, but I want to make sure. If that's it, though, I'm rather unsure how to translate it.