refactor: migrate to material symbols icon set

src/app/modules/settings/page/calendar-sync-settings.html

@@ -66,7 +66,7 @@
             (click)="syncCalendar(true)"
           >
             <ion-label>Sync Now</ion-label>
-            <ion-icon slot="end" name="refresh"></ion-icon>
+            <ion-icon slot="end" name="sync"></ion-icon>
           </ion-button>
         </ion-item>
         <ion-item *ngIf="isWeb">
@@ -97,13 +97,13 @@
             <ion-label>{{
               'settings.calendar.export.backup' | translate
             }}</ion-label>
-            <ion-icon slot="end" name="device-floppy"></ion-icon>
+            <ion-icon slot="end" name="save"></ion-icon>
           </ion-button>
           <ion-button fill="clear" (click)="restoreInput.click()">
             <ion-label>{{
               'settings.calendar.export.restore' | translate
             }}</ion-label>
-            <ion-icon slot="end" name="refresh"></ion-icon>
+            <ion-icon slot="end" name="settings_backup_restore"></ion-icon>
           </ion-button>
           <!--suppress CheckEmptyScriptTag -->
           <input

src/app/modules/settings/page/settings-page.html

@@ -1,3 +1,18 @@
+<!--
+  ~ Copyright (C) 2022 StApps
+  ~  This program is free software: you can redistribute it and/or modify it
+  ~  under the terms of the GNU General Public License as published by the Free
+  ~  Software Foundation, version 3.
+  ~
+  ~  This program is distributed in the hope that it will be useful, but WITHOUT
+  ~  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  ~  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  ~  more details.
+  ~
+  ~  You should have received a copy of the GNU General Public License along with
+  ~  this program. If not, see <https://www.gnu.org/licenses/>.
+  -->
+
 <ion-header>
   <ion-toolbar color="primary" mode="ios">
     <ion-buttons slot="start">
@@ -42,6 +57,6 @@
     (click)="presentResetAlert()"
   >
     {{ 'settings.resetSettings' | translate }}
-    <ion-icon slot="start" name="arrow-back-up"></ion-icon>
+    <ion-icon slot="start" name="device_reset"></ion-icon>
   </ion-button>
 </ion-content>