Make URL capitalisation consistent in UI

URL is an acronym, it should be all caps.

public/app/features/plugins/partials/ds_http_settings.html

@@ -5,19 +5,19 @@
   <div class="gf-form-group">
     <div class="gf-form-inline">
       <div class="gf-form max-width-30">
-        <span class="gf-form-label width-7">Url</span>
+        <span class="gf-form-label width-7">URL</span>
         <input class="gf-form-input" type="text"
               ng-model='current.url' placeholder="{{suggestUrl}}"
               bs-typeahead="getSuggestUrls"  min-length="0"
               ng-pattern="/^(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?$/" required></input>
         <info-popover mode="right-absolute">
-          <p>Specify a complete HTTP url (for example http://your_server:8080)</p>
+          <p>Specify a complete HTTP URL (for example http://your_server:8080)</p>
           <span ng-show="current.access === 'direct'">
-            Your access method is <em>Direct</em>, this means the url
+            Your access method is <em>Direct</em>, this means the URL
             needs to be accessible from the browser.
           </span>
           <span ng-show="current.access === 'proxy'">
-            Your access method is currently <em>Proxy</em>, this means the url
+            Your access method is currently <em>Proxy</em>, this means the URL
             needs to be accessible from the grafana backend.
           </span>
         </info-popover>
@@ -30,7 +30,7 @@
         <div class="gf-form-select-wrapper gf-form-select-wrapper--has-help-icon max-width-24">
           <select class="gf-form-input" ng-model="current.access" ng-options="f for f in ['direct', 'proxy']"></select>
           <info-popover mode="right-absolute">
-            Direct = url is used directly from browser<br>
+            Direct = URL is used directly from browser<br>
             Proxy = Grafana backend will proxy the request
           </info-popover>
         </div>