Einen schönen 4.(vierten) Juli
Fröhlichen vierten Juli! or Fröhlichen Unabhängigkeitstag (=independence day)
In Samoan, you would say "Manuia le Fa'atalofa'aga o le aso o le Fa'aleupolu," which translates to "Happy Fourth of July." However, it's important to note that specific celebrations like the Fourth of July may not have a widely recognized phrase in all languages, including Samoan. The sentiment can be expressed by conveying good wishes for the day.
Assuming you mean "how" to say happy in German, there are a couple of different ways: Froh and gluecklich.
happy fourth anniversary -- bon quatrième anniversaire de mariage
Happy Friday in German is glücklicher Freitag
Juli
happy - glücklich Also fröhlich, froh
In Pennsylvania German, you can say "Ei glickliche Geburdsdaag!" to wish someone a happy birthday.
I am not a happy puppy is an English idiom and cannot be translated into German in a way that conveys it's meaning.
happy married life = glückliches Eheleben
"Happy Saint Patrick´s Day" in German is: Fröhlichen St. Patricks Tag
Frohes Neues Jahr.