Replace remaining Android-specific strings

Also renaming the helper composables so it's a bit easier to find/replace everything
in forks.

app/src/main/java/eu/kanade/tachiyomi/extension/api/ExtensionUpdateNotifier.kt

@@ -7,7 +7,7 @@ import eu.kanade.tachiyomi.data.notification.NotificationReceiver
 import eu.kanade.tachiyomi.data.notification.Notifications
 import eu.kanade.tachiyomi.util.system.cancelNotification
 import eu.kanade.tachiyomi.util.system.notify
-import tachiyomi.core.i18n.localizePlural
+import tachiyomi.core.i18n.pluralStringResource
 import tachiyomi.i18n.MR
 
 class ExtensionUpdateNotifier(private val context: Context) {
@@ -18,7 +18,7 @@ class ExtensionUpdateNotifier(private val context: Context) {
             Notifications.CHANNEL_EXTENSIONS_UPDATE,
         ) {
             setContentTitle(
-                context.localizePlural(
+                context.pluralStringResource(
                     MR.plurals.update_check_notification_ext_updates,
                     names.size,
                     names.size,