Move must have origin text to resource

Add RepositoriesMustHaveRemoteOriginHowToFix resource string.
Add Margin="4" to TextBlocks to make them appear as paragraphs.

Author: jcansdale

src/GitHub.Resources/Resources.Designer.cs

@@ -842,4 +842,7 @@ https://git-scm.com/download/win</value>
   <data name="RepositoriesMustHaveRemoteOrigin" xml:space="preserve">
     <value>Repositories must have a remote called "origin" defined in order to locate their GitHub URL.</value>
   </data>
+  <data name="RepositoriesMustHaveRemoteOriginHowToFix" xml:space="preserve">
+    <value>Please rename one of your existing remotes to 'origin' or add a new remote named 'origin' and fetch. This can be done from the command line or by clicking the button below.</value>
+  </data>
 </root>

src/GitHub.Resources/Resources.resx

@@ -36,13 +36,15 @@
                 Text="{x:Static ghfvs:Resources.RepositoriesMustHaveRemoteOrigin}"
                 TextWrapping="Wrap"
                 TextAlignment="Center"
-                HorizontalAlignment="Center" />
+                HorizontalAlignment="Center"
+                Margin="4" />
 
-            <TextBlock
-                Text="Please rename one of your existing remotes to 'origin' or add a new remote named 'origin' and fetch. This can be done from the command line or by clicking the button below."
+            <TextBlock                
+                Text="{x:Static ghfvs:Resources.RepositoriesMustHaveRemoteOriginHowToFix}"
                 TextWrapping="Wrap"
                 TextAlignment="Center"
-                HorizontalAlignment="Center" />
+                HorizontalAlignment="Center" 
+                Margin="4" />
 
             <Button HorizontalAlignment="Center"
                 Margin="0,15"