Add some feedback when performing some actions (#552)

* Add a way to display flash messages

* Make the flash messages look nice

* Add actual feedback messages

* cargo fmt

* Move flash messages to PlumeRocket

And add trait to convert PlumeRocket to BaseContext

* Remove useless lifetime

src/routes/notifications.rs

@@ -2,23 +2,22 @@ use rocket::response::{Flash, Redirect};
 use rocket_i18n::I18n;
 
 use plume_common::utils;
-use plume_models::{db_conn::DbConn, notifications::Notification, users::User};
+use plume_models::{notifications::Notification, users::User, PlumeRocket};
 use routes::{errors::ErrorPage, Page};
-use template_utils::Ructe;
+use template_utils::{IntoContext, Ructe};
 
 #[get("/notifications?<page>")]
 pub fn notifications(
-    conn: DbConn,
     user: User,
     page: Option<Page>,
-    intl: I18n,
+    rockets: PlumeRocket,
 ) -> Result<Ructe, ErrorPage> {
     let page = page.unwrap_or_default();
     Ok(render!(notifications::index(
-        &(&*conn, &intl.catalog, Some(user.clone())),
-        Notification::page_for_user(&*conn, &user, page.limits())?,
+        &rockets.to_context(),
+        Notification::page_for_user(&*rockets.conn, &user, page.limits())?,
         page.0,
-        Page::total(Notification::count_for_user(&*conn, &user)? as i32)
+        Page::total(Notification::count_for_user(&*rockets.conn, &user)? as i32)
     )))
 }