Add option to change school from SettingsActivity

app/src/main/res/values-it/strings.xml

@@ -11,6 +11,7 @@
 
     <string name="preferences_general_header">Generale</string>
     <string name="preference_notifications_header">Notifiche</string>
+    <string name="preferences_school">Scuola</string>
     <string name="preferences_dark_theme">Tema scuro</string>
     <string name="preferences_notify_new_circulars">Mostra notifiche</string>
     <string name="preferences_poll_interval">Intervallo di sincronizzazione</string>

app/src/main/res/values/strings.xml

@@ -11,6 +11,7 @@
 
     <string name="preferences_general_header">General</string>
     <string name="preference_notifications_header">Notifications</string>
+    <string name="preferences_school">School</string>
     <string name="preferences_dark_theme">Dark theme</string>
     <string name="preferences_notify_new_circulars">Show notifications</string>
     <string name="preferences_poll_interval">Synchronization interval</string>

app/src/main/res/xml/root_preferences.xml

@@ -3,6 +3,11 @@
 
     <PreferenceCategory app:title="@string/preferences_general_header">
 
+        <ListPreference
+            app:key="school"
+            app:title="@string/preferences_school"
+            app:useSimpleSummaryProvider="true" />
+
         <ListPreference
             app:defaultValue="auto"
             app:entries="@array/dark_theme_entries"