Starcraft II ending transcript

You can add the Subtitle in the cinematic, as iber pointed out in his answer in the Options menu.

Now the transcriptions. (forgive-me if I made some mistakes, not my primary language)

Starcraft 2 Wings of Liberty

0:39 Sarah.
0:50 You're reading all this?
0:52 You have your orders, Mister Findlay. Carry them out.
1:03 Tychus. What have you done?
1:10 I made a deal with the devil, Jimmy. She dies I go free.
1:20 We all got our choices to make.
1:28 Damn shame.
1:34 pew pew pew pew...
1:41 Jim?
1:43 It's ok. I got you.
1:51 ~Song that I don't know the name, but it's cute, romantic and a little sad.~

Source

Starcraft 2 - Heart of the Swarm

1:06 Hello Kerrigan. I've being waiting for you.
1:11 I'm surprised you haven't try to escape.
1:14 Escape? My dear, I'm afraid you got all wrong.
1:40 Really? Did you think I keep an animal like you close to me, without some kind of insurance policy?
1:56 Clearly, you're my greatest failure. Now, at long last You Will DIE.
2:13 Change of plans!
2:31 You can never suffer enough for all the lives that you ruined, Arcturus.
2:40 I made you into a monster Kerrigan
2:46 You made us all into monsters
3:34 Thank you Jim
3:40 For everything
3:48 My pleasure darling
3:56 Always was
4:20 I now see my true enemy.
4:25 He waits for me in the void.
4:28 Wielding powers I can only imagine.
4:32 I go to face him, having renounced everything.
4:37 My humanity.
4:40 My identity.
4:42 The man I love.
4:45 But I'll not face this enemy alone.
4:50 I'm the SWARM!

Source

PS: I wrote the WoL too because I watched it first and only when I finished the transcription I noticed that it was not the HotS =X

PS2: As pointed out by iber you can do it in-game, without too much trouble.

"Menu > Options > Gameplay. It is under the right column of choices".

I can't help you directly. Still you can turn on subtitles and watch ending again.

Menu > Options > Gameplay. It is under the right column of choices.

Hope this will work for you.