"I am not happy."
Translation:Saya tidak senang.
I have heard the phrases you mentioned in Jakarta. I have found that, as a foreigner, anything I say that can be understood is a welcome translation. On rare occasions someone have very politely explained when my bahasa Indonesia was not an appropriate phrasing. When the first thing said to you is, You speak bahasa ... accompanied by a big smile, you know your attempted are very welcome.