De ce pentru francezi 8 mai este o sarbatoare importanta

WWII Victory Day (la fête de la victoire, le jour de la libération) is a holiday to celebrate the end of World War II and the French people's freedom. It is the anniversary of when Charles de Gaulle announced the end of World War II in France on May 8, 1945. --with help from google. 

WWII Victory Day

It is an important holiday that is there to celebrate the end of WW2 which was debatably one of the worst wars in history, and to celebrate French Freedom. This holiday boots Morale as well as helps people remember the lives lost in the war.

Hope this helped.

Translated for you if you only speak Spanish: 

Día de la Victoria de la Segunda Guerra Mundial

Es una fiesta importante que está allí para celebrar el final de la Segunda Guerra Mundial, que fue debatably una de las peores guerras de la historia, y para celebrar la libertad francesa. Esta fiesta arranca Morale, así como ayuda a la gente a recordar las vidas perdidas en la guerra.

ce is used with the verb être as follows: in its singular form, c'est, means it is /this is /that is, and in its plural form, ce sont, means they are /these are /those are.