Changes arrow from buttons to svg

manage.html

@@ -372,7 +372,10 @@
         <span id="backup-message" i18n-text="backupMessage"></span>
         <div id="backup-buttons">
           <div class="dropdown">
-            <button class="dropbtn"><span>Export</span> <i class="arrow down"></i></button>
+            <button class="dropbtn">
+              <span>Export</span>
+              <svg class="svg-icon select-arrow"><use xlink:href="#svg-icon-select-arrow"/></svg>
+            </button>
 
             <div class="dropdown-content">
               <a href="#" id="file-all-styles" i18n-text="bckpInstStyles"></a>
@@ -381,7 +384,10 @@
           </div>
 
           <div class="dropdown">
-            <button class="dropbtn"><span>Import</span> <i class="arrow down"></i></button>
+            <button class="dropbtn">
+              <span>Import</span>
+              <svg class="svg-icon select-arrow"><use xlink:href="#svg-icon-select-arrow"/></svg>
+            </button>
 
             <div class="dropdown-content">
               <a href="#" id="unfile-all-styles" i18n-text="retrieveBckp"></a>

manage/manage.css

@@ -1088,23 +1088,6 @@ input[id^="manage.newUI"] {
   /* background-color: #3e8e41; */
 }
 
-#backup-buttons i {
-  border: solid black;
-  border-width: 0 2px 2px 0;
-  display: inline-block;
-  padding: 3px;
-}
-
-#backup-buttons .up {
-  transform: rotate(-135deg);
-  -webkit-transform: rotate(-135deg);
-}
-
-#backup-buttons .down {
-  transform: rotate(45deg);
-  -webkit-transform: rotate(45deg);
-}
-
 /* sort font */
 @font-face {
   font-family: 'sorticon';