Add a missing apostrophe to Let's Get Started, and add commas to dashboard greeting.

frontend/src/lib/greeting.js

 const greetingPrefixes = [
-    'Hey there',
-    'How\'s it going',
-    'Howdy',
-    'Greetings',
-    'Good to see you',
+    'Hey there,',
+    'How\'s it going,',
+    'Howdy,',
+    'Greetings,',
+    'Good to see you,',
 ];
 
 const subheadPrefixes = [
@@ -22,7 +22,13 @@ var Greeting = {
 
 	sayHello: function(personalization) {
         if(personalization) {
-            return Greeting.simpleGreeting() + ' ' + personalization;
+            var g = Greeting.simpleGreeting();
+            if (g == 'How\s it going,'){
+                return g + ' ' + personalization + '?';    
+            } else {
+                return g + ' ' + personalization;
+            }
+            
         } else {
         	return Greeting.simpleGreeting();
         }

frontend/src/setup/components/Setup.jsx

@@ -50,7 +50,7 @@ export default class Setup extends Component {
                         <div className="relative z2 text-centered ml-auto mr-auto" style={{maxWidth: 550}}>
                             <h1 style={{fontSize: '2.2rem'}} className="text-brand">Welcome to Metabase</h1>
                             <p className="text-body">Looks like everything is working. Now let’s get to know you, connect to your data, and start finding you some answers!</p>
-                            <button className="Button Button--primary mt4" onClick={() => (this.completeWelcome())}>Lets get started</button>
+                            <button className="Button Button--primary mt4" onClick={() => (this.completeWelcome())}>Let's get started</button>
                         </div>
                         <div className="absolute z1 bottom left right">
                             <div className="inline-block">