Merge pull request #3441 from micpob/patch-26

Uniform text with the rest of the course

Author: mluukkai

src/content/13/en/part13c.md

@@ -503,9 +503,9 @@ The current code for the application is in its entirety on [GitHub](https://gith
 
 <div class="tasks">
 
-### Tasks 13.17-13.18.
+### Exercises 13.17-13.18.
 
-#### Task 13.17.
+#### Exercise 13.17.
 
 Delete all tables from your application's database.
 
@@ -515,7 +515,7 @@ Make a migration that initializes the database. Add <i>created\_at</i> and <i>up
 
 **NOTE2:** if you have to delete tables from the command line (i.e. you don't do the deletion by undoing the migration), you will have to delete the contents of the <i>migrations</i> table if you want your program to perform the migrations again.
 
-#### Task 13.18.
+#### Exercise 13.18.
 
 Expand your application (by migration) so that the blogs have a year written attribute, i.e. a field <i>year</i> which is an integer at least equal to 1991 but not greater than the current year. Make sure the application gives an appropriate error message if an incorrect value is attempted to be given for a year written.
 
@@ -1057,9 +1057,9 @@ The current code for the application is in its entirety on [GitHub](https://gith
 
 <div class="tasks">
 
-### Tasks 13.19.-13.23.
+### Exercises 13.19.-13.23.
 
-#### Task 13.19.
+#### Exercise 13.19.
 
 Give users the ability to add blogs on the system to a <i>reading list</i>. When added to the reading list, the blog should be in the <i>unread</i> state. The blog can later be marked as <i>read</i>. Implement the reading list using a connection table. Make database changes using migrations.
 
@@ -1107,7 +1107,7 @@ Also modify the individual user route _GET /api/users/:id_ to return not only th
 
 At this point, information about whether the blog is read or not does not need to be available.
 
-#### Task 13.21.
+#### Exercise 13.21.
 
 Expand the single-user route so that each blog in the reading list shows also whether the blog has been read <i>and</i> the id of the corresponding join table row.
 
@@ -1482,9 +1482,9 @@ From the command line, you can also run rollbacks, i.e. undo migrations. The com
 
 <div class="tasks">
 
-### Task 13.24.
+### Exercise 13.24.
 
-#### Task 13.24.
+#### Exercise 13.24.
 
 Grand finale: [towards the end of part 4](/en/part4/token_authentication#problems-of-token-based-authentication) there was mention of a token-criticality problem: if a user's access to the system is decided to be revoked, the user may still use the token in possession to use the system.