I'm a native Japanese speaker and have lived in Japan for 27 years since I was born.
I have studied in a Japanese national university, Chiba university during 2010 - 2015 and also staying in Brighton, UK for 1 year.
Please see below translation of the samples.
The translation is more like formal.
If you need it casual, I can do it as you like.
1. Hi %s, happy to see you! You can live video chat with people from across the world and make new friends
ようこそ%sさん!ビデオチャットを通じて世界中の人々と繋がりましょう。
2. Start Discovering
友達を探しましょう。
3. Hi %s, making new friends is now rewarding. Get coins when you make new friends. You can get USD 100 for every 100,000 coins you earn
こんにちは%sさん。新しい友達を見つけることで報酬を得ましょう。100,000コイン毎にUSD 100を手に入れることができます。
4. Learn more
さらに詳しく...