That's okay. "Saya minta 2 kopi." or "Saya pesan 2 kopi." with nice tone and smile is polite enough. Don't forget to say "Terima kasih." when your cups arrive. ;)

Belajar bahasa Indonesia tanggal 15 Maret 2016

1. Written: Kenapa Anda sekarang di luar/keluar kantor meskipun belum dapat izin dari orang Jepang?
Spoken: Kenapa Anda sekarang di luar kantor meski belum dapat izin orang Jepang?
(You could use one of them, there is a subtle difference. "di luar" = to be outside, "keluar" = to go out.)

Written: Pastikan untuk melapor pada/memberitahu orang Jepang sebelum di luar/keluar kantor untuk mengirim barang.
Spoken: Pastikan untuk lapor pada orang Jepang sebelum keluar kantor untuk kirim barang.
("Make sure to inform the Japanese..." fyi, you could use "menginformasikan", but the sentence would sound too formal. It's used in TV/radio news or in the other very formal and important announcement.)

Hati-hati lain kali. (←How to say" next time, please be careful" dalam bahasa Indonesia?)
(This one is fine, but "Lain kali hati-hati." is more natural in spoken/real life situation, and "Lain kali berhati-hatilah." is more natural in acts or written sentences.)

2. Written: Biasanya sebelum dapat izin dari orang Jepang, Anda tidak bisa/dapat/boleh di luar/keluar kantor sendirian.
Spoken: Biasanya sebelum dapat izin orang Jepang, Anda tidak boleh keluar kantor sendirian.
(Biasanya=usually. "tidak bisa" is fine, but tidak dapat or tidak boleh are more natural. "Tidak boleh" has a stronger meaning of "you are able to do it physically but are not permitted to do so.")

3. Saya mau minta data hasil penjualan ke India dari Januari 2015 sampai Desember 2015.
(How to say " Please send the data by PDF file" dalam bahasa Indonesia?)
("Tolong kirimkan datanya dalam format .pdf" lit. "Please send the data in .pdf format.")

4. Mohon kirimkan data itu segera/secepatnya.
("segera" is totally fine, but "secepatnya" is slightly more natural. "kirimkan" or "kirim" is used because it's an imperative sentence "Send the data...")

5. A: Saya baru saja dapat e-mail dari Anda. Bolehkah saya sekarang memproses itu? (Artinya "Is it ok to proceed this
now?")
B:Boleh.
(Move the particle "kah" from the end of the sentence to the word "boleh".)

6: Tolong lihat lampirannya. (Please see attachment.)
(Like number 4, "di"+infinitive is not suitable for an imperative sentence.)

Afaik, "kepengker". :)

Mboten purun/mboten kersa. :)

I kinda disagree with that I read somewhere that 누가 is 누구+가, but to make it easier it become 누가. Similar case with 저+가=제가 or 누구+는=누군 words just change sometimes. Hehehe... :)

It's from Javanese. Should be written as "Aja rame-rame!" but people tend to write it as "Ojo rame-rame". 'Aja' means "Don't... " (in Indonesian: "Jangan...") 'rame-rame' (in Indonesian: ramai-ramai) has 2 meanings, the first one 'to be noisy', the other one is 'to be crowded'. So depending on the context "Aja rame-rame"/"Jangan ramai-ramai" could mean "Don't be noisy/Shut up/Be quiet" or "Don't be crowded". The first case obviously can be used if you want to tell people or children to be quiet. The second case can be used when you're visiting someone in hospital with your friend but you don't want the room to be crowded (take turns to go inside). Ah, if you think your sentence would be ambiguous, in Indonesian you could say "Jangan berisik" (Don't be noisy) instead of "Jangan ramai-ramai".