Fix textile references

However, I did not rename the textilizable block ...

[ci skip]

spec/features/block_editing_spec.rb

@@ -150,7 +150,7 @@ describe 'My project page editing', type: :feature, js: true do
 
     # edit form should be open
     find('#block_title_a').set 'My title'
-    find('#textile_a').set 'My *textile* content'
+    find('#textile_a').set 'My **commonmark** content'
     find('#a-form-submit').click
 
     # expect changes to be saved
@@ -159,7 +159,7 @@ describe 'My project page editing', type: :feature, js: true do
     custom_block = find_block(hidden, :a)
 
     expect(custom_block).to have_selector('.widget-box--header-title', text: 'My title')
-    expect(custom_block).to have_selector('#a-text strong', text: 'textile')
+    expect(custom_block).to have_selector('#a-text strong', text: 'commonmark')
 
     # edit form should be closed
     expect(custom_block).to have_no_selector('#block_title_a', visible: true)

spec/models/my_projects_overview_spec.rb

@@ -56,7 +56,7 @@ describe MyProjectsOverview, type: :model do
       ce = subject.new_custom_element
       expect(ce[0]).to eq("a")
       expect(ce[1]).to be_kind_of String
-      expect(ce[2]).to match(/^h3\./)
+      expect(ce[2]).to match(/^### Custom text/)
     end
 
     it "can save a custom element" do