I was just wondering why all the verbs here on DL are shown with an r on the end, whereas in my deck of Swedish Anki cards they end with a vowel?
The infinitive form of a verb generally ends with an a. However in the present tense they useually end with an r.
"Att studera" - "To study"
"Jag studerar" - "I study" / "I am studying"
I study Architecture, and I have a test on History of Architecture next week, so I'm studying for it. Is there a difference between saying "I study Architecture" and "I am studying History of Architecture" in Swedish? I mean, in the "studerar"? Or are both of them "Jag studerar ____"? Is there any way to differentiate "What do you study" and "What are you studying"?
When you are studying for a test, and often in colloquial language, you say "plugga" (literally "plug/hammer in). When you find it really hard, you can even say "hamra in", even more literally.
I don't speak Swedish (yet)—I am only at Level 12, so I might be wrong, but I'd say you could just create a compound word arkitekturhistoria from arkitektur and historia.
Quite right. We don't differentiate between "What do you study" and "What are you studying"?, both are Vad studerar du?
Yes it is. And also, the 'd' in "du" is often pronounced like an 'r' in modern standard Swedish, just like in the example.