I´ll begin the questions below:

Language Questions:

What do these mean? :
-Allahma/ Allahma oldu
-Ne gecelar (said before sleeping?)
-Yok saôl (said like ´no thanks´?)

Cultural Questions:

Is it true that you are viewed as mentally
challenged or stupid in Turkey if you repeat your words often, if you use Allah expressions a lot, if you smile a lot and if you are always saying optimistic sayings? 

Language Question:

What do these mean?:

- Ne güzel işte?

- Ne oldu

-Kolay garson (said when entering a room with a male)

my attempt

Ne güzel! = How nice!

ne güzel, işte = How nice, here you are

Ne oldu? = What happened?

Kolay gelsin = May your work be easy, (usually said to someone who is working on something, expressing the wish that their work will become easier)