mark deprecated strings as such

src/main/res/values/strings.xml

@@ -86,6 +86,7 @@
     <string name="always">Always</string>
     <string name="always_load_remote_images">Always Load Remote Images</string>
     <string name="once">Once</string>
+    <!-- deprecated -->
     <string name="show_warning">Show Warning</string>
     <string name="not_now">Not now</string>
     <string name="never">Never</string>
@@ -974,7 +975,7 @@
     <string name="learn_more">Learn More</string>
 
     <string name="devicemsg_self_deleted">You deleted the \"Saved messages\" chat.\n\nℹ️ To use the \"Saved messages\" feature again, create a new chat with yourself.</string>
-    <!-- %1$s will be replaced by the amount of storage already used, sth. as '500 MB'. If you want to use a percentage sign, type in two of them, eg. %1$s %% -->
+    <!-- deprecated -->
     <string name="devicemsg_storage_exceeding">⚠️ Your provider\'s storage is about to run out: %1$s%% are already used.\n\nYou may not be able to receive messages if storage is full.\n\n👉 Please check if you can delete old data in the provider\'s web interface and consider enabling \"Settings / Chats / Delete Old Messages\". You can check your current storage usage anytime at \"Settings / Connectivity\".</string>
     <!-- %1%s will be replaced by date and time in some human-readable format -->
     <string name="devicemsg_bad_time">⚠️ Date or time on your device seems to be inaccurate (%1$s).\n\nAdjust your clock ⏰🔧 to ensure your messages are received correctly.</string>