1) Do you consider the translation of the game into other languages important? (If yes, then into which languages?)
Yes, but it depends on your target audience; not all cultures have the same interests.
2) Do you use external services for game testing?
Does that exist? Why didn't anyone tell me... Where?
3) How important are specialized fonts for different languages to you?
I use RPG Maker, and I don't know if I can implement something like that.