Opt-in weekly sending of statistics

src/stats.rs

@@ -232,7 +232,7 @@ async fn send_stats(context: &Context) -> Result<ChatId> {
     let chat_id = get_stats_chat_id(context).await?;
 
     let mut msg = Message::new(Viewtype::File);
-    msg.set_text(crate::stock_str::stats_device_message(context).await);
+    msg.set_text(crate::stock_str::stats_message_body(context).await);
 
     let stats = get_stats(context).await?;
 

src/stock_str.rs

@@ -440,7 +440,9 @@ https://delta.chat/donate"))]
     #[strum(props(fallback = "Scan to join channel %1$s"))]
     SecureJoinBrodcastQRDescription = 201,
 
-    #[strum(props(fallback = "todo"))]
+    #[strum(props(
+        fallback = "The attachment contains anonymous usage statistics, which helps us improve Delta Chat. Thank you!"
+    ))]
     StatsMessageBody = 210,
 }
 
@@ -1290,7 +1292,8 @@ pub(crate) async fn unencrypted_email(context: &Context, provider: &str) -> Stri
         .replace1(provider)
 }
 
-pub(crate) async fn stats_device_message(context: &Context) -> String {
+/// Stock string: `The attachment contains anonymous usage statistics, which helps us improve Delta Chat. Thank you!`
+pub(crate) async fn stats_message_body(context: &Context) -> String {
     translated(context, StockMessage::StatsMessageBody).await
 }