Use sentence case for Experience CS project names

As per this issue [1]. I thought it was worth doing this aspect of that
issue now given that it tends to take a while to get changes to
editor-api deployed to production.

When I ran the rake task, I saw the following output which seemed to
make sense:

    > bundle exec rake projects:create_experience_cs_examples
    Scratch project with identifier 'experience-cs-example' already exists
    Scratch project with identifier 'experience-cs-example' updated successfully
    Scratch project with identifier 'dialogue-in-scratch' already exists
    Scratch project with identifier 'dialogue-in-scratch' has not changed
    Scratch project with identifier 'ten-block-mission' already exists
    Scratch project with identifier 'ten-block-mission' updated successfully
    Scratch project with identifier 'blank-scratch-starter' already exists
    Scratch project with identifier 'blank-scratch-starter' updated successfully
    Scratch project with identifier 'lets-explore-scratch' already exists
    Scratch project with identifier 'lets-explore-scratch' updated successfully
    Scratch project with identifier 'transforming-sprites' already exists
    Scratch project with identifier 'transforming-sprites' updated successfully

[1]: RaspberryPiFoundation/experience-cs#454

Author: floehopper

lib/tasks/projects.rake

@@ -13,7 +13,7 @@ namespace :projects do
         identifier: 'experience-cs-example',
         locale: 'en',
         project_type: Project::Types::SCRATCH,
-        name: 'Experience CS Example',
+        name: 'Experience CS example',
         user_id: nil
       },
       {
@@ -27,28 +27,28 @@ namespace :projects do
         identifier: 'ten-block-mission',
         locale: 'en',
         project_type: Project::Types::SCRATCH,
-        name: 'Ten Block Mission',
+        name: 'Ten block mission',
         user_id: nil
       },
       {
         identifier: 'blank-scratch-starter',
         locale: 'en',
         project_type: Project::Types::SCRATCH,
-        name: 'Blank Scratch Starter',
+        name: 'Blank Scratch starter',
         user_id: nil
       },
       {
         identifier: 'lets-explore-scratch',
         locale: 'en',
         project_type: Project::Types::SCRATCH,
-        name: "Let's Explore Scratch",
+        name: "Let's explore Scratch",
         user_id: nil
       },
       {
         identifier: 'transforming-sprites',
         locale: 'en',
         project_type: Project::Types::SCRATCH,
-        name: 'Transforming Sprites',
+        name: 'Transforming sprites',
         user_id: nil
       }
     ]