settings: Wrap subsections into seperate divs.

Following templates are affected: display-settings.handlebars and
ui-settings.handlebars.
There will be no UI change, it is just to make code more readable.

static/templates/settings/display-settings.handlebars

@@ -1,5 +1,6 @@
 <div id="display-settings" class="settings-section" data-name="display-settings">
     <form class="display-settings-form">
+        <div id="user-lang-settings">
             <!-- this is inline block so that the alert notification can sit beside
             it. If there's not an alert, don't make it inline-block. -->
             <h3 class="inline-block">{{t "Language settings" }}</h3>
@@ -16,7 +17,9 @@
             </div>
 
             {{ partial "default_language_modal"}}
+        </div>
 
+        <div id="user-display-settings">
             <h3 class="inline-block">{{t "Display settings" }}</h3>
             <div class="alert-notification" id="display-settings-status"></div>
 
@@ -52,7 +55,9 @@
                 </label>
                 <label for="left_side_userlist" class="inline-block">{{t "User list on left sidebar in narrow windows" }}</label>
             </div>
+        </div>
 
+        <div id="user-time-settings">
             <h3 class="inline-block">{{t "Time settings" }}</h3>
             <div class="alert-notification" id="time-settings-status"></div>
 
@@ -81,7 +86,9 @@
                     {{/each}}
                 </select>
             </div>
+        </div>
 
+        <div id="user-emoji-settings">
             <h3 class="inline-block light">Emoji style</h3>
             <div class="alert-notification" id="emoji-settings-status"></div>
 
@@ -118,5 +125,6 @@
                     {{t "Translate emoticons (convert <code>:)</code> to 😃 in messages)" }}
                 </label>
             </div>
+        </div>
     </form>
 </div>

static/templates/settings/ui-settings.handlebars

@@ -2,7 +2,7 @@
     <div class="alert" id="ui-settings-status"></div>
     <form class="ui-settings-form">
         <div class="tip">{{t "Features for the brave. Labs features may change, break, or disappear at any time." }}</div>
-
+        <div id="lab-ui-settings">
             <h3>{{t "UI Settings"}}</h3>
 
             <div class="input-group">
@@ -17,5 +17,6 @@
                     {{t "Enable desktop notifications for new streams" }}
                 </label>
             </div>
+        </div>
     </form>
 </div>