WL-3318 : Remove irrelevant bits of tutorial & use English spellings

'Sakai' is mentioned because the default is 'Sakai' if there is no 'site.name' property.
I've made it get the 'ui.service' property instead which is 'WebLearn' (and then we can push it back).
Merge pull request #5 from ox-it/WL-3318

WL-3318 : Remove irrelevant bits of tutorial & use English spellings