One of the best ways to make your friends happier is to be happier yourself. That is, you tend to be happier when you are around people who are happier. Similarly, your happiness will rub off on your friends. Relationships, no matter the form, are a key to happiness. Therefore, just spending time with your friend can make both of you happier. Make sure to encourage one another, as well as offer gratitude for the relationship, all of which will increase her happiness. For instance, you could let her know that you value her friendship by telling her regularly, such as saying "I just want you to know how glad I am you're in my life," or by sending her a card every now and then. "Laughter is the best medicine" is a saying for a reason. Laughing can make you happier and healthier as a person, so try to get your friends to laugh by cracking jokes or even poking (light) fun at yourself. Everyone needs to hear they are are smart, strong, and beautiful sometimes. Don't be afraid to tell your friend these things, as they can help her build confidence and self-esteem. Try to make your compliments unique to the person, so she knows you truly mean what you say. For instance, saying "I really like how you take the time to listen to everyone you meet. It shows how much you care about people." is a more specific compliment then, "You're a good listener." If your friend is grouching about a situation at work, for instance, help her see the positive side of things. That doesn't mean you should downplay her feelings. In fact, definitely hear out her problem before reacting. But try to help her asking probing questions such as, "What things can you do to make the situation better?" or "What's been happening at work lately that's been good?" Research shows that those who choose to look for happiness learn to be more optimistic overall, making them happier in general. True happiness is in part about the adventure. It may mean you may need to step outside of what's comfortable and try something new, and in turn, discover new things...

How would you rephrase that briefly using Indonesian?
Anda harus bahagia. Habiskan waktu bersama. Buat dia tertawa. Tingkatkan kepercayaan diri teman. Bantu teman untuk melihat sisi positifnya. Coba hal baru bersama.