Behat: fix tests

tests/behat/features/systemAnnouncements.feature

@@ -18,5 +18,5 @@ Feature: System Announcements
   Scenario: Delete system announcement
     Given I am on "/main/admin/system_announcements.php"
     When I follow "Delete"
-    Then I follow "Yes"
+    Then I press "Yes"
     Then I should see "Announcement has been deleted"

tests/behat/features/toolDocument.feature

@@ -7,7 +7,7 @@ Feature: Document tool
 
   Scenario: Create a folder
     Given I am on "/resources/document/files?cid=1&sid=0"
-    Then I press "New folder"
+    Then I follow "New folder"
     And I fill in the following:
       | c_document_title | My new directory |
     And I press "Save"
@@ -15,7 +15,7 @@ Feature: Document tool
 
   Scenario: Create a folder that already exists
     Given I am on "/resources/document/files?cid=1&sid=0"
-    Then I press "New folder"
+    Then I follow "New folder"
     And I fill in the following:
       | c_document_title | My new directory |
     And I press "Save"

tests/behat/features/toolExercise.feature

@@ -44,7 +44,7 @@ Feature: Exercise tool
   Scenario: Add question "Multiple choice" to exercise created "Exercise 1"
     Given I am on "/main/exercise/exercise.php?cid=1"
     And I follow "Exercise 1"
-    And I follow "Add questions"
+    And I follow "Edit"
     And I follow "Multiple choice"
     When I fill in the following:
       | questionName | Multiple choice |