Spelling: StackExchange → Stack Exchange (elementary#2049)

Spelling: StackExchange (URL title) → Stack Exchange
StackExchange → StackExchange
Stack Exchange → StackExchange

_templates/header.php

@@ -149,7 +149,7 @@
                     <li><a href="https://mastodon.social/@elementary" target="_blank" rel="noopener" data-l10n-off title="Mastodon"><i class="fab fa-mastodon"></i></a></li>
                     <li><a href="https://medium.com/elementaryos" target="_blank" rel="noopener" data-l10n-off title="Medium"><i class="fab fa-medium-m"></i></a></li>
                     <li><a href="https://www.reddit.com/r/elementaryos" target="_blank" rel="noopener" data-l10n-off title="Reddit"><i class="fab fa-reddit"></i></a></li>
-                    <li><a href="https://elementaryos.stackexchange.com" target="_blank" rel="noopener" data-l10n-off title="StackExchange"><i class="fab fa-stack-exchange"></i></a></li>
+                    <li><a href="https://elementaryos.stackexchange.com" target="_blank" rel="noopener" data-l10n-off title="Stack Exchange"><i class="fab fa-stack-exchange"></i></a></li>
                     <li><a href="https://twitter.com/elementary" target="_blank" rel="noopener" data-l10n-off title="Twitter"><i class="fab fa-twitter"></i></a></li>
                     <li><a href="https://join.slack.com/t/elementarycommunity/shared_invite/enQtMzU1NDU4OTE1MjY2LWUyOTBkZGNkZGM4MDgzZjE2ZjRiZDgwMDQ1ZTA0MzcxYjI0MDUyNGRlNDI5ZWViNDkwMzMwYzczMDY2ZjA0MTc" target="_blank" rel="noopener" data-l10n-off title="Slack"><i class="fab fa-slack-hash"></i></a></li>
                 </ul>

docs/human-interface-guidelines.md

@@ -475,7 +475,7 @@ See also:
 
 1. [Why 'Ok' Buttons In Dialog Boxes Work Best On The Right](http://uxmovement.com/buttons/why-ok-buttons-in-dialog-boxes-work-best-on-the-right/) by UX Movement
 2. [Why The Ok Button Is No Longer Okay](http://uxmovement.com/buttons/why-the-ok-button-is-no-longer-okay/) by UX Movement
-3. [Should I use Yes/No or Ok/Cancel on my message box?](http://ux.stackexchange.com/questions/9946/should-i-use-yes-no-or-ok-cancel-on-my-message-box) on UX StackExchange
+3. [Should I use Yes/No or Ok/Cancel on my message box?](http://ux.stackexchange.com/questions/9946/should-i-use-yes-no-or-ok-cancel-on-my-message-box) on UX Stack Exchange
 4. [Where to Place Icons Next to Button Labels](http://uxmovement.com/buttons/where-to-place-icons-next-to-button-labels/) by UX Movement
 
 ## Popovers {#popovers}
@@ -634,7 +634,7 @@ Since Text buttons have a clear and explicit label, it's usually unnecessary to
 ---
 
 1. [Why The OK Button Is No Longer Okay](http://uxmovement.com/buttons/why-the-ok-button-is-no-longer-okay/) by UX Movement
-2. [Should I use Yes/No or Ok/Cancel on my message box?](http://ux.stackexchange.com/questions/9946/should-i-use-yes-no-or-ok-cancel-on-my-message-box) on UX StackExchange
+2. [Should I use Yes/No or Ok/Cancel on my message box?](http://ux.stackexchange.com/questions/9946/should-i-use-yes-no-or-ok-cancel-on-my-message-box) on UX Stack Exchange
 
 ## Search Fields {#search-fields}
 

get-involved.php

@@ -109,7 +109,7 @@
         </div>
         <div class="half">
             <h3>Question &amp; Answer</h3>
-            <p>StackExchange is a Q&amp;A website built around finding the best answers to common questions. Anyone can create an account to start asking and answering.</p>
+            <p>Stack Exchange is a Q&amp;A website built around finding the best answers to common questions. Anyone can create an account to start asking and answering.</p>
 
             <div class="actions actions--column">
                 <a class="button flat suggested-action" href="https://elementaryos.stackexchange.com/unanswered">Unanswered Questions</a>

support.php

@@ -95,7 +95,7 @@
 
     <a class="column third" href="https://elementaryos.stackexchange.com" target="_blank" rel="noopener">
         <i class="fab fa-stack-exchange"></i>
-        <h3 class="read-more">StackExchange</h3>
+        <h3 class="read-more">Stack Exchange</h3>
         <p>Check out answers to some of the most common questions we get.</p>
     </a>
 </div>