Happy Friday in German is glücklicher Freitag
Happy Friday = Hau'oli Pō.ʻalima [how'ohlee po-ah-lee-ma]
You can't say Happy Friday in Hebrew, but a common greeting on Friday afternoons is Shabbat Shalom (שבת שלום).
Assuming you mean "how" to say happy in German, there are a couple of different ways: Froh and gluecklich.
hadre fridia
You do not say "Happy Good Friday" in greek.... you actually say "Good Resurrection" which is "Kali Anastasi"
"What are you doing this Friday night?" = "Was machst du Freitagabend?"
To say "Happy Friday" in French, you can say "Joyeux vendredi." Another common expression is "Bon vendredi." Both phrases convey a cheerful greeting for the end of the week.
heureux, c'est vendredi !
sexta-feira feliz
happy - glücklich Also fröhlich, froh
Viernes noche feliz
In Pennsylvania German, you can say "Ei glickliche Geburdsdaag!" to wish someone a happy birthday.